I suppose this is a little pointless, since the OP has decided he hates us :(, but I think its rather evident that the question wouldn't have been a good fit for SU with someone familiar with it.
There's really two parts to why the question wasn't a good fit for the site
"I am looking for a place to find Windows 7 Themes" - Its no different from a book recommendation type question - you're eliciting a list (which dosen't fit the Q&A format), for external resources which might go down at the whims of the owner. A good question has self contained answers.
"tips to build such a theme" once again, this will end up being chatty and open ended.
So, as per the FAQ, with a slightly more critical reading
"You should only ask practical, answerable questions based on actual problems that you face. Chatty, open-ended questions diminish the usefulness of our site and push other questions off the front page"
I'm not sure how it would be possible to fix the question without a massive edit that would change the context, scope and intent of the question. I'd definately have closed it. If I didn't mind completely changing the scope and context of the question, but not the intent, I'd consider the end result needed is optimising my desktop for fast RDP, rather than focusing on low colour depth, and ask a more general question, suggesting colour depth as one aspect of what I was trying to do. This would help avoid the xy problem
I'll probably drop the mod in question a line, but this was a question which someone familiar with the site would have closevoted.
However, this sort of discussion is well suited for root access.