GIMP is a great graphics program with a lot of capability. The only limitation I've found so far is in the ability of the operator (me). When Laura put out this weeks What's Your Play #63 I decided I'd have a little fun and work on some of my GIMP skills. Below you'll see smaller images of the original and my modifications. By layering the picture and eliminating various elements I was able to "Oilify and Canvas" the horse, change the color of the bars to brown, "Cartoon" the stall, and "Desaturate" the ceiling. I should note the these are just beginning skills, but they sure can be a lot of fun to play with. If you can't afford the more expensive programs you should give GIMP a try.
To see larger versions of the photographs click on the image.