Most of the question asked within customization process, are things like shell replacement, meaning replacement of explorer.exe with another fast, useful shell.Like replacing, hiding the toolbar, Regarding shells like, Litestep, Blackbox, Serenade, Talisman, Aston, WinStep, DesktopX and others. For a detail description on the matter , check this link,
[link] Black Box
And most of the things for the new people in the community, we find it hard how to submit and get our work exposed well, on the deviantArt community. Here is the a link you can use.
Starting from there you can get more of those links, but that is my favorite.
For the skins development and questions, regarding to what i am using which is rainmeter here is the link [link]. A straight link to the manual [link]. Any thing's which you need understanding on, i am free to say. Please ask...