James: listen to different stuff.. some times the problem can really be that the music your listening to is leaving you wanting to get to a certain standard, which you dont find very inspiring...
You could also go down the avantguard route, of just making cool sounds with you guitar... in some cases you dont even need strings on yer guitar to make em (speaker on the pick ups combined with fx, and turning the tone nob back and forth is a favourite of mine, but i'm sure it cant be good for yer pick ups).
You could also put the guitar down for a long while, until you WANT to pick it up again... you can't force your self to enjoy something, so sometimes just put yer guitar down, and maybe pick up a harmonica, keyboard etc etc, it makes for more intresting music in the long run (that's what i've found anyway)...