If you've never checked out MyNoise.net then you are absolutely missing out. DOZENS of noise blockers, ambiance generators, and other things (even better if you make a one-time donation and you get all of them, for life) to calm, meditate, use as RPG backgrounds, and more.

This particular piece was drawn after a long, LONG day, while listening to the "Summer Night" generator. Crickets, a gentle breeze, and all the problems seem worlds away...