I love my Chumby, as seen embedded to the right, in it's virtual glory. Mine is black in color, but that's the live feed of the widgets I've got running on it. A cool flash widget is Photo Frame by wansti@gmx.de, which surprisingly, doesn't show up in the virtual version. Ah well.
I installed the widget, which culls a local (or web) store of pictures and displays them randomly. Seeing an opportunity to create some 'adult' content for this device, I began my quest for better content, specifically resized and compressed for the Chumby. Having too much free time on my hands, I hopped to it.
I made a couple of public feeds for those with a Chumby, the PhotoFrame widget installed. When you're configuring the widget on the Chumby site, simply use these public URLs. I've got the images.xml and crossdomain.xml files up and running, and have checked all of these feeds on my own Chumby.
BTW, You can run multiple instances of the Photo Frame widget in any channel, as long as you name them differently. I have all of these feeds being used by my Chumby every day.