PaintCat is an awesome painting program for OS X, PaintCat brings back the missing paint application in the Mac platform. Paint a picture, draw over a picture or even crop or apply effect like invert to existing images.
PaintCat offers a wide range of features and many settings within each feature.
PaintCat includes a color palette that allows tyou to choose both foreground and background colors with which to work.
PaintCat is really easy to use and supports FullScreen mode so you can let your creative side wild without distractions!