I've been reading about a creativity technique Leonardo da Vinci used. Cracking Creativity by Michael Michalko describes how da Vinci would look at stains on walls, patterns in mud etc and imagine seeing battles and figures within the random patterns. Sometimes he would even fill a sponge with paint and throw it at a wall to see what the patterns suggest.
I devised an equivalent for 2005 using my PC's Paint accessory: I will search for some random google images and select one image (often a complex image with many colours). I will copy and paste the image into Paint and then go into Image Attributes and change the image to black & white. Then I go to Image and Invert Colours. I can select areas of the image to find inspiration or select specific areas with the Magnifying Glass tool.