I'm not sure if this has been posted already, if it has my bad.
Skittles is apparently doing a promotion where you can get 7 day trial codes for xbl.
I assume this was originally meant to require purchasing skittles but apparently you can reuse the codes.
Just enter the codes on the site, fill in information and repeat ad infinitum.
Originally came across this via here, http://www.thetechga...ed-5-18-14.html
I just tested again to make sure it still works and it does.
Just to clarify this does not give you games for gold, but it's still really worth it if you just want to play for a bit while a certain company is taking their sweet time to release their game on pc.
Edit: added another code