While I know everyone can potentially make great pictures in photoshop, pixelmator, or other high end programs, part of the fun here is dealing with limitations of these programs with less functions. For instance, most of the time, I'm using paintbrush because I have more macs at my disposal... and paintbrush actually has less features than paint... ie. no lasso tool.
So, lets start a thread here for any tips and tricks that you may have found that lets you use these paint programs to their utmost potential, as a resource for those that want to head that way.
Stick figures still make me laugh though, so you probably won't see much here from me, lol.