Here's what I did: spilled buttons, coins, sticks, toothpicks, small stones. Pasta could be fun or small stones. How about rubber bands. Think about spilling items that are somewhat uniform in size and shape. And no arranging! I spilled on a contrasting background for my photo shoot so that the items would stand out sharply.
What I'm looking for is the shape of the items and the shapes around them. And patterns, of course.
You may want to just print the photos and find interesting areas of them. You may want to crop the photos and then print them.
Let's use the comments to share ideas of what you spilled. And of course, upload to Flickr! Enjoy.