Here's a free set of Photoshop Custom Shapes. Some I've made, some are Photoshop defaults and others I've found online.

Using custom shapes is a blast in Photoshop! They'll help you generate lot's of cool, abstract ideas that you can refine into solid ideas, whether they're characters or environments.

Made with Photoshop CS4, will work in CS5, 6, and CC+.

Have fun with them!