This is a set of 11 brushes I made for GIMP some time ago. The brushes are made from scans of paper and allow you to create a wrinkled/crinkled look without having to use a texture, allowing for more customization of you work. These seem to work best with dark colors and multiply/overlay layer modes.
If anyone would like to help me convert these to photoshop brushes as well, just send me a note