The sticker spray in ArtRage allows the importation of Photoshop brushes.

Select the sticker spray
Open the preset panel
Click the menu button at the top right of this panel and choose 'Import Photoshop brush'
You can then browse to the .abr file you want to import
Note: Only bitmap based Photoshop brushes will work with ArtRage

If you have any problems at all, please feel free to email me at [email protected] with the details, I'll be happy to help.