This is me screwing around in Photoshop CS2’s gallery of FILTERS.
I’ve never personally used any of the filters, but some of them give nice effects…keyword being “some”. It takes a lot of toying with.
The first slide is the original, done with airbrush/brush combo in SAI.
CS2 filters [left to right]: Watercolor, Posterize, Paint Daub, Angled Strokes, Crosshatch, Ocean Ripple, PLASTIC WRAP
Which is your favorite? Personally, I really like how Paint Daub came out. :D