A Little Help Please...

I having been looking all over the place for paint swipes, or smears, or whatever they're called and can't find anything and can't figure out how to do it. The only thing I've been able to find are paint smears for PS. I was wondering if someone could help me, please!

The red swipe here is kinda what I'm looking for. by gilkurtis

PS...I use PSP9, if it matters.