I do a fair amount of original stuff, but one thing I've always loved is trying to record covers. Some of them are fantastically awful and never see the light of day. Some I'm happy with. I do more electronic backings these days, so these are stylistically as such. I try to keep somewhat to the original though.
Probably going to get flamed for my vocals, but whatevs. I've never professed to be a great singer, and I like trying to make things dirtier/harsher in general.
If anyone does anything similar, feel free to share