Thank you so much for writing this up, it was a tremendous help. I've just completed my first color theme (for Blanket) and will submit to dreamscapes as soon as I can think of a name.

Ah, incidentally, they have this really neat way of displaying info, source and preview of what you've created at dreamscapes (goes after the "author" part of the template):

Layout: < a href="http://www.dreamwidth.org/customize/advanced/layerbrowse?id=xxxxxx">Info || < a href="http://www.dreamwidth.org/customize/advanced/layersource?id=xxxxxx">Source || < a href="http://www.dreamwidth.org/customize/preview_redirect?themeid=xxxxxx">Preview

[Ehm, I have no idea how to display code as plain text, so hope this is alright]

It's not in their profile (as far as I can see), but it's a cool thing to know nonetheless :)