I've been experimenting with some new icons for OS6 theme on my Curve 3G. With some help from the excellent iconarchive.com and some inspiration from BBThemeLab, I'm currently at this state:
I thought I'd share my home-brew SocialFeeds icon which comprises of the usual social icons plus some arrows... The download contains 256, 128 and 52px images. For editing icons/images - I use IcoFX which is an excellent freeware util.