This set contains 28 high resolution brushes for Adobe Photoshop CS, CS2, CS3 and CS4. The size of each shapes is 1280x1024 pixels. If you want to convert them to vector you can easily do so by following the steps in this tutorial.
You can use them for create abstract / minimalistic vector backgrounds. Download
For more Adobe Photoshop brushes of that kind, you can have a look at the Author's DA Profile.