At the top of each page, just above the post box and to the left, is something called "next blog>" and when you click on that, you get just that; a random blog, good or bad, amazing or terrible; some have been floating unused and abandoned for years, some are new, some will make you jump.
No way of knowing what will come up next, but if you do find one you like, get the URL or something, because you may never find it again.
Yesterday I spent an hour playing Next Blog.
I think Im hooked on this. =)