I was never really happy with the dots background, but of the choices offered when I started my blog, I found it to be the best. I started noticing that a friend's blog always had changing backgrounds, and then today noticed the link. Not sure I'll stick to this background, but for now I like it better than the dots.
I should have known that it was possible to change my background from those offered by google. I follow lots of blogs on blogspot. Perhaps I just didn't care enough any other time I logged in.