ok, gotta name different stuff:
well when I want expierimental type shit I listen to like The Fall Of Troy and The Sound Of Animals Fighting.....only if you can stand screaming tho
If you want some really different rap, I recommend The Streets, they are british..
Alt/Emo/Screamo-Definitely comes to Thrice
If you are into more alternative music... Kings Of Leon....well they are just fantastic IMO
When I want something really heavy I usually go with Stone Sour or Fear Factory'
If you are into heavy stuff and really want to try something different, I recommend Kyuss. One of the members, Josh Hommes, started Queens Of The Stone Age, and let me tell you, QOTSA used to be really good, back in the early 90's. Kyuss is what people classify as "Stoner Rock" meaning it is very melodic and repeating for the most part. Two of my fave songs of theirs are "50 Million Year Trip" and "Gardenia"
If you are interested in a whole new genre, check out some good ol Rockabilly like Nashville Pussy or Tiger Army.
Hopefully these give you a few ideas