Paint .NET 2.0 very neat, very free photo editor coded in .NET 1.1
I am not graphically inclined in the slightest but I found it fun to play with and for those of you who aren't so artistically challenged there is a source included download available. I'll probably dig into the source sometime in the year 2035 when I have free time again just out of curiousity.
I've always used ms-paint to quick and dirty editing, I think I'm going to try to use this application instead.