I have never drawn buildings . . . I hate how they're so rigid and technical. The skyline backgrounds I draw for my comic are just shaded rectangles made with my graphics program's shape tool. xD I'm looking up tutorials though, to learn at least enough to draw a decent-looking edifice.
Oh, and furniture, too. And also animals. Seascapes. Practically anything that isn't a human being.
. . . Yes, I should definitely go practice. xD