First off I love the variety in Glitch but It would be cool if there were a slider bar or something to select pretty much any colour. Sometimes I can't find a certain colour so it just bugs me.
^ Judging from what the devs have been saying over the last few weeks, I think new clothes (and possibly a new avatar designer) is high on their priority list - so I guess we'll see if they've implemented that soon! Great idea :)
A new avatar designer (and a new publishing/management system for avatar assets) is the highest thing on our priority list right now (there is a lot of other stuff going on as well which will happen simultaneously, but that's #1!)
We will have lots more colors available, but it probably won't be a free-form picker: given the way the coloring happens, a huge amount of the color space gives really bad results. Also, it is very likely that free players will have a vastly-reduced palette to choose from, vs those who subscribe ;)