I found this last night, during my search. A chocolate rib cage! Couldn't you just die?!? The original project on the website was to fill the ribcage with organs made of cake with a filling that oozed out when the organs were cut. Pretty nasty looking, but a great idea! Click on the link at the bottom of this entry to see the full cake. Definitely worth looking at! (And then check out the zombie head cake!!!)
I fell in love with the rib cage part more so than the rest and it looks easy enough. I'm thinking about making this for my mother's Halloween Dinner this Sunday, though I might make it smaller. It's tempting to try to make it large so it can hold the Bone cookies, but we'll see. A smaller one might be cool and easier. We'll see if I have the time!
Hm... I wonder how chocolate bones would work in bento... Or if I can make one to work in it... hm...
Anyways, here's the link for the cake. The ribcage instructions are on page two: http://www.theyrecoming.com/extras/pumpkinfest03/