25 PS brushes that replicate the backdrops you'd find in a professional photographer's studio.
created in PS CS2, using a PC, but they should also work on a Mac .. but they probably won't work in versions of PS prior to CS.
it's a large file .. but so are Studio Backdrops.

to use them, you'll have to import the .abr file into PS.
there's a few ways of doing this .. my preferred method is to drag and drop the file into the C:/Program Files/Adobe/Adobe Photoshop/Presets/Brushes .. and the next time you open PS, they'll be listed in the Brushes list.

if you don't know how to access the Brushes .. press B on your keyboard.