Ok, this is going to sound really weird.. but your best bet? 

Go camping.

No.. I'm not joking.  When the weather gets nice enough, pack some stuff and get out of the house.  Leave your cell phone, laptop, and anything else that requires batteries or electricity other than maybe a flashlight behind.

Don't take any CD players, portable TV's, portable gaming systems or anything with you, and get outdoors for a while.  A couple of days is good, a week or so is better.  Get away from all the distractions and noise that fill your daily life and just kick back and relax.

Lay out at night and gaze at the stars.  Sleep as late as you want the next day, eat breakfast cooked over an open fire, and for goodness sake don't spend a single second thinking about your computer, rendering, artwork, poser, or anything else that you normally think or worry about.  Instead go lose yourself in nature for a short while.

You'll be amazed at the results.