Funky stuff is always fun to play, even if you don't particularly like it - go to your tab website and look up some Jamiroquai songs, they have a good mixture of choppy chord progressions and unison riffing. Also check out Prince, I recommend "Computer Blue" and, of course, "Purple Rain".
A metal riff that I find a lot of fun is "Train of Consequences" by Megadeth. It has a great groove to it, and is interesting in that it's mostly played with upstrokes and heavy palm-muting.
Also, I know their songs are piss-easy, but I find Cake songs great fun to play, especially when you're singing/rapping along :D.
"It's all folk music... I ain't never heard no horse sing!"
- Attributed variously to Leadbelly and Louis Armstrong
If at first you don't succeed, you are obviously not Chuck Norris.
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