Here are some abstract-style Photoshop brush packs for free which can help you with your next artwork.
This Photoshop brushes is suitable on making colorful abstract style of backgrounds. You can also enhance your Digital Paintings in using this Photoshop brush. This will also produce a 3D effect that would provide glow on your art work.
Below are images and links for you to check out the must have abstract styles in Adobe Photoshop brushes.