When I post my own topic on different websites and such, sometimes I might change the color and mess around to make it look more interesting. However, I usually leave the colors alone, especially since I'm usually concerned with formatting if the text and if the post is appealing to the viewer. Colors are usually not such a huge focus for me.
But I really used to love orange and green (cantaloupe colors, now that I think about it.) Orange represented the 'shoot-first-ask-questions-later' and reckless side of me (the part that's extremely loud and vibrant), while green would represent a mellower, more serious and introspective side of me. I could never find a color that could fit both sides of my personality (just like I can't really find people who can deal with both sides really well either.)
No color could really describe for a while, so I took to calling my soul black. Cheesy, I know.
Now I particularly like Maroon and teal. Also into shades of off-white or beige... I just like colors. I can't choose now that I think about it.