This blog

So I'm kind of annoyed with this blog layout I have. I tried changing the blog background, but with the new "design" template's blogger has, I can't figure out how to change it. I have been doing a template from a website, but I can't figure out how to even get a new one on. So now that I've erased it, my blog is just plain. Anybody know how to put a cute background or new template on a blog? Any tips would be helpful. Thanks.