Guild Wars 2

So when you create a character you choose colors for your armor. Are you stuck with those colors forever or can you change them?

You can change the color of your armor via dye.

http://wiki.guildwars2.com/wiki/Hero#Dye_tab

You get a set of starter colors. After that, you have to buy them, craft them from the cooking profession or get them from the Mystic Forge as they no longer drop from regular gameplay. The trading post will be your cheapest source of most dyes.

The starter color doesn’t matter at all. I think in the original implementation it would be your default colors on any new gear you equipped, but the way it works now is a new item takes its colors from what you have on at the time you swap to it.

The moment you arrive in the tutorial, you can change your dyes freely from those you have at the start, and any time at all you want to change them with new dyes you can. Plus dyes are account wide, so when you learn a new dye on one alt, every alt for the rest of your life will have that dye for free.