When I heard that potatoes were added to MC, the next natural conclusion is that potato batteries should be added in IC. You could make them with a potato, an uninsulated copper cable and a tin cable, and should contain about 750 EU. When they're empty, right click and you get your cables back. (This destroys the potato) I can imagine some crazy automated farm producing potato batteries.
Also, for the lolz, Potato GLaDOS should be a possibility. Add some circuits, and BAM, GLaDOS quotes are just a click away.