Image 1: Place Kitty head on workspace
Image 2: Use quick select tool to select kitty head. Once it's selected, right click on kitty and select copy (this will get rid of the white background).
Image 3: quick select kitty head again, then go to Edit->define brush
Image 4: Name your kitty brush and click ok
Image 5: Go to brushes present (or brushes) and select kitty brush
Image 6: DRAW MULTIPLE KITTIES
Image 7: Edit Hue/Saturation/color balance/brightness to liking
Image 8: I give you cycledelic kitty