Axeraider70 has created different sets of amazing photoshop brushes for us. It enables us creating some images with abstract style easily. All of the brushes are released under Creative Commons License 3.0. You can freely use them for non-commercial use. There is a Brush Download and Insertion Guide available too.

Requirements: -
Demo: http://axeraider70.deviantart.com/gallery/#Photoshop-Brushes
License: Creative Commons 3.0 License