75 Unusual Photoshop Brushes
"One of the reasons Photoshop brushes are so useful is because of their limitless use. Most of the brush packs that are available for free fall into one of several major categories, such as floral brushes, grunge brushes, splatter brushes, and of course a few others. However, there are also a number of unique and unusual brush packs that you may not be aware of. In some cases, these may prove to be very useful for a particular project."