I've been wanting to start this topic for the longest time, but I just kept forgetting about it! Well, right now I'm procrastinating on homework, so it's the perfect moment. ^^;
^In case you're not familiar with the subject at hand. I have only one solid strain of synesthesia, and it's with numbers. This is how I see them:
Yikes; that looks so much uglier than I thought it would...anyway, yeah, that's my perception of Arabic numerals. Although they usually change their 'tint' a little depending on the context: my brain doesn't like this picture, because the numbers shouldn't necessarily be those shades of those colors, considering the ones they're next to. But it'll have to do.
Anyway, It can help with memorizing things for tests...like, the Faraday constant (96485 C/mol) is all warm-colored numbers (kind of), stuff like that. But it gets me confused a lot, too, particularly with 2 and 4...sometimes I mix up numbers that start with 4 with ones that start with 2, because they're all 'red' to me. I don't have that issue with 5 and 9, though, even though their colors are just as similar. ¯ \ _(ツ) _ /¯
0 and 1 don't have specific colors...and that's it, I guess. I do see some letters in colors, but only a few, so I don't think it's worth mentioning.
I also have a tendency to think of people's voices as flavors...like grape juice, Coca-Cola, red wine, etc. Sometimes these flavors aren't even real: what I call the 'grape juice' voice comes from a specific depiction of grape juice I saw on a cartoon once, and I guess I just conceptualized it somehow. So if I think you have the grape juice voice, what I'm really thinking is that 'you sound like what that looked like it tasted like'. Hehe. ^^;