If you like chilled music trip hop is always great, you can't go wrong with:
Massive Attack - Black Milk, Paradise Circus, Superpredators, their album Mezzanine
Bonobo - Cirrus, Kiara, Towers His album Black Sands
Portishead - Roads, Glory Box
Emika- Double Edge, My Hearts Bleeds Melody (this one more electronica rather than trip hop but it's still cool) and Drop the Other
Other music of various genres:
Vancouver Sleep Clinic - Vapour, Stakes, Flaws
Ben Howard - Black Flies, The Wolves, I Forgot We Were Here, Oats in the Water
Bon Iver - Pretty any song by them
The Black Keys - any song from the Albums Brothers and Al Camino
And So I Watch You From Afar - I Conquer Castles, The Voiceless
Ling Tosite Sigure - Kimi To Oku, Monster
Beirut - Postcards from Italy, Nantes, Guyamas Sonora, Cherbourg
Sorry about the sheer number of different songs, its incredibly hard to pick just a few to recommend. Let me know what you think of any of the songs should you decide to listen to them!