For those of you who were a part of the old Stoner Rock Forums (RIP), this will be old news, but for people like me, this will be something cool you have to see. MS Paint Album Covers is a collection of pictures on Flicker of album covers of classic (word used loosely) album covers of genres all over. The info states it was started on the old Stoner Rock and Forever Doomed forums, and it sort of gained a life of it's own. There are thousands to scroll through, and more are being added every day so you'll never finish the list completely. Check it out and be amazed at some of the creativity and the preciseness that people put into these. I would never have that much patience.
Here are some of my favorites, based on quality and the original. I was going to try and make them smaller but it didn't do them justice: