Ahhhhh, that happens to me (thinking of words/names) too but I've never thought it could be synesthesia... Thank you for helping me figure out a lifelong mystery.

Anyway, these are the colors that come to mind for certain CBers.

Myself: (Firelily) a neon red/orange/yellow.

Azalea: a soft pink/purple.

Agent Winter: kinda an icy blue/grey.

MoonKitten: a dark grey background with a moon (cough, cough, duh)

Cynthia Maple: kind of a crimson-brown

Honeybee: golden 'honey' yellow 

Hazel Magnolia: This may sound weird, but basically brown/pink/purple stripes... um, yeah.

Writing_in_the_dark: black with yellow polka dots.            Ummm, don't judge XD. 

Wreeboo: Umm, I kinda... picture you... as.. a..  bear? (please don't take that as an insult, bears ar adorable) So like a warm fuzzy brown.

Morning: sky blue

Tealeaf: darkish green

Cranberry: Deep red

Emekittycon K: Bright orange

Silver Crystal: silver and white and grey

Star Princess: Lilac, gold, and silver

dreamiing: Galaxy colors, like purple blue pink white orange green silver gold-- *gasps for breath* like all colors??? 

moonshine: silvery blue

moon kitsune: dark grey and orange

Starseeker: black/grey

Feline Fantasy: cream/orange/yellow

Sammy Everlast: lime green/red

Sybill: silvery colors, like you'd see in a crystal ball

Periwinkle: ... well, periwinkle blue.

Nyx: Deep black and silver

SNS: blue/black/grey/purple

Princess Juniper: green/brown/yellow

Lazerbat: Laser-y colors, like neon der, green, and yellow

Luminescence: Eerie blue-green

Starchaser: purple/silver

NerdFace: pale green/yellow 

Sunflower: (an irl friend :)) bright sunflower yellow/black

Ohmygosh, there are SO MANY more. I don't want to make a bunch of work for the Admins though. :) So I'm not going to put all the colors I imaginine CBers to be. But uh yeah these are some. 

I have very strong synesthesia (mostly with music, letters, and words) so this'll be fun.

Firelily is a sort of maroon color, with hints of red, orange, and purple.

Azalea is pink and light blue.

Luna-Starr is a dark purple.

Luminescence is varying shades of blue.

Honeybee is yellow and pastel green.

Tealeaf is forest green and olive.

Bakerloo is a bright blue.

Tealeaf, I associate you with the colours of green tea: sage green, rich honey yellow, a hint of dark brown.

Lumi, you're like a galaxy: magenta and turquoise, tempered by silver, gold, and black.

Sybill, you're black and red; I associate leather jackets with you as well.

Aza is a pale pink, rich tan, dark rich brown combination.

Starch is my inverse: white, gold, purple, but not ostentatious. 

Honeybee is a golden, rich honey colour; also dark brown and the colour of sunlight through new spring leaves. Also pale pink.

Moth is purple, magenta, and red, the colours of late nights spent staring at blank screens.

Kitten is a series of pastels; yellow, purple, orange, brown.

Win is a bright, electric blue, shot through with red, silver, and black.

The Admins are a dark, reddish mahogany colour.

Peregrine is a city skyline; shades of pale greys and soft yellows.

Leo is shades of orange, yellow, and blue.

~Starseeker 

I associate them with colors, too! It's definitely not synesthesia. I don't actually see the colors and there wouldn't be a right or wrong color, I just am able to match them up with colors, like, "if 8 had a color it would be yellow" and I think that's the case for most people.

Starchaser - bronze

Periwinkle - cyan

Honeybee - golden yellow (AgAiN lol)

Wreeboo - bright yellow (caaaause their first NaNo pfp which is basically what I associate a bunch of y'all with)

Sky Nightstar - navy blue (I'm still getting used to your name not being Nightfall)

Me - purple 

Azalea - also cyan

Lazerbat - grey-brown

Rainbow Riot - RaInBoW duh but mostly a bright, reddish pink. 

I associate most CBers with colors! It's cool to see how they compare to what other people see.

Tealeaf- shades of green

Azalea- a very specifc shade of pink, like fuchsia 

Wreeboo- beige or pale yellow

Lumi- bright blue

Honeybee- amber and mahogany

Sybill- forest green

Moth- grey and deep red

Kitten- reddish orange, warm tones

Luna-Starr- a combination of midnight blues and dark purples (I was on a walk recently around dusk and the sky made me think of you)

Starseeker- navy blue with splashes of silver

dreamii- pale blue and lavender

Fidelity- pale pink

Leo- a mustard yellow

woolly- dark brown and purple 

I do this too!

Tealeaf - a pale orange

Lazerbat - red orange

Kitty Cat - deep purple

Cynthia M. - mint green with a bit of yellow

Writing_in_the_dark - midnight blue 

Quill - lavender

That's all for now but if I didn't get you then let me know if you want to know what I imagine your color and I will tell you.  

Continuing this--

Starseeker, you're yellow, with hints of pale purple.

Kitten is lavender.

Quill, you're a very dark purple.

Starchaser is an orangey-yellow.

Agent Winter is an icy blue mixed with silver and light greys.

Moth, you're dark red and very dark purple. 

Oh, I love these! :)

dreamii- bright blue and purple

Lazerbat- red and yellow

Bakerloo- royal blue

Firelily- spring green and bright yellow

Peregrine- heather and light brown

Lumi- midnight blue

Win- bright blue 

Kitten- purple

Nerd- orange

Leafy- green and pink

Moth- red

Feline Fantasy- dark green

Wreeboo- yellow

Fallen Leaf- brown and hints of green 

Jaybells- blue

It's weird- sometimes as I get to know a person, I stop thinking of them as certain colors. I used to think of Sybill as blue and grey, but I... don't anymore? And there are some, like Quill, Azalea, Leo, and Morning, that I picutre as people rather than colors. It's odd.

Tealeaf is a sort of pale yellow-brown color

Star Princess is a set of oranges, pinks, and yellows

Lumi is a golden-y color

Lazerbat is black and bright red

Firelily is like deep red and soft whites

Honeybee is bright yellow and black

peppermint is white and red

Twilight is pink, purple, blue, and a hint of orange

Joan B. of Arc is a metallic silvery color

NiteSkiies is black, silver, yellow, and white

I (SNS) am silvery-white

Feline Fantasy is pinks and ochres

Jaybells is blue and golden

Periwinkle is, well, periwinkle, which is like a blue-purple pastel color

Kitten is black green and white

Luna-Starr is silver and gold

Starchaser is yellow and golden

Starseeker is yellow and ochre 

Fallen Leaf is golden, red, and orange

moth is gray

Peregrine is white and greys 

HeY GuYs i'M GoNNa Be SelF CenTERed AnD ReMiNd YoU I ExIsT.

Sorry.

Also math is blue and ELA is red. 
So there.