Polyvore is a wonderful website! Not only can you make fashion inspiration boards, you can pretty much make a board based off of anything you want. Polyvore works by you searching for any item you can think of in any color. You then comb through all of the images that the engine spits back at you from the internet, then you select an image of your liking, drag it to the work space, and continue on this path until you have come up with something like this:
This was my first take at the whole inspiration board thing, so excuse the image quality *eek*
I spy one of my invitation designs...