Kudos for the effort and so on, but the thing I can't understand is, who would use these backgrounds, unless they specifically want their site to look like their grandmother's house.

It's 2014. By now we've realized it's counter-productive to stamp your background with pictures and patterns, because they distract from your site's content, and make it harder to read.

Don't have content? The solution isn't funky backgrounds. It's: have content, or don't have a site.