Songs are colors. For example, One Step Closer by Linkin Park is a green song, while In the End is more of a dark maroonish. Crawling by Linkin Park is yellow. Paint it Black by the Rolling Stones is kind of a pale blue. Here Comes the Sun by the Beatles is also blue, but bright blue with silver flecks. Certain classes of musical instruments are also colors. Brass tends to be red, while strings tend to be green. Percussion is yellow, woodwinds are brown, and electric guitars are fire-engine red. Despite that, a song that is almost completely strings can sound red.
People are colors and shapes. My friend Billy is kind of a blobby lime green. Zuko is orange with a dynamic shape. Katara is blue with spikes of red. Aang is kind of a blue-grey with a smooth texture. The Doctor (Doctor Who) has a different color for each regeneration. The Tenth Doctor (Tennant) is blue, the Ninth Doctor (Eccleston) is black, McGann's Doctor is electric blue. Tom Baker's Doctor is bright red and brown. Gregory House is raw-flesh red with flecks of ice blue. Lisa Cuddy on the other hand has more texture than color--she's a very spiked ball. Stacy Warner is just a smooth blobby grey. BanishedPrince, you are a red with black ribbons. Heartsyhawk is more yellow. Ichigo Kurosaki is very orange, Rukia is kind of a dark blue, Kon just needs to get stabbed (oh, but he's a puke green)
Some smells have color. Cinnamon is kind of orange. Wood lock oil is more of a relaxing yellow-orange. (it's my favorite smell) Wasabi is kind of a bright green, more like grass green, with little yellow capsules.
Colors and sounds also can be punctuation marks. A bright color is an ! as well as a loud or startled sound. I tend to like ! colors more. ? colors are ones that are kind of muted versions of ! colors. Colors that show as . colors are neutral colors, like the ones on the DeviantArt stuff. Black is a ... color, and white is more of a ...? to me for some reason. Flat grey is more of a perpetual non-punctuated color. It bores me.
When I read, I can hear a thought-voice speaking the words. When I talk, I get a thought-page typing it (usually on a typewriter). That's why I hate reading in public places; the two sets of words/voices get mixed up.
Concepts and emotions also have color. Honor is gold, courage is red, cowardice is a wastewater brown, loneliness is blue (the blue on the first Avatar t-shirt with chibis), hate is spiky red-orange, determination is purple, and happiness is sky blue. Hope is yellow (though that might be Digimon influenced), power is red, despair is black, wisdom is brown, sadness is a dark blue, envy is dark purple, bitterness is orange, and vengeance is dark red. Romantic love can be either blue (deep love) or red (superficial love). Family love is the color of a hug. That can either be a relaxing brown or a blue. Arrogance is bright yellow and at the same time green.
It's not that I see auras, because generally I can't tell a person's color until after I know them fairly well, but I do get first impressions. I don't get along well with people who's first color is tan or yellow. That's mostly jocks, preps, and redknecks. (that was blunt, and I'm sorry) People whose colors end up as yellow or tan are okay for some reason, but not if they have a strong yellow or tan at first. I also don't make friends easily with people who have initial colors of dark blue, purple, or red. These people are usually goths. If someone I have just met is a green, for example, then I find out they're a perv, their color instantly switches to the color of sewage and they lose a few points. I also don't get along well with pink people. Ty Lee's "color", oddly enough, is not pink. It's white.
Zutarans are generally orange, Kataangians are canary yellow, Maiko shippers are dark red, and Sukkans are green.
People can have outer colors and inner colors. The girl down the street is a pink and orange (which is one reason I don't get along with her well), but her inner color is more of a navy blue. (also why I don't get along with her). Inner colors show more often in dramatic/deep moments, when they think no one is watching them or when they've come to tears about something. Or sometimes when they're in "diary mode", when they divulge their secrets to everyone.
And obviously I can't see my own color due to the fact that it's like being a judge in a contest you're participating in--I'm kinda biased.