I don't know if I can say that I'm a skinner yet... :P
The best option (for me) is to make available all the skins in the same place than Road Runner... so we could send the finished skin to guino, and he could upload all together to his web page. The forum is another alternative, yes, but it's more useful for previews, comments or suggestions when the work is "in progress".
PD.- Maybe some donations for web hosting and own domain? (don't try www.roadrunner.com )