Here's a little example of an Acorn plugin I put together in Python (with the help of Kevin Ballard), which takes an image and ages it by messing up the colors a bit to make it look faded (Kevin wrote that part), and then giving it round corners. Here's the before and after:





You can grab the source to the plugin on the Acorn wiki. Python + Apple's Core Image makes simple things like this ridiculously easy.