Personally I look at books or magazines or even other galleries for inspiration and sometimes films or tv programmes too, anything that might jog an idea!!
Failing that I give the Wife a shout and go and have some fun doing something totally different!!!
The down side of that is when you have an idea when you're in the middle of something and have to go start it!!

Injustice will be avenged.
Cofiwch Dryweryn.