I've always thought that uncoated truffles looked a little like the dung balls certain beetles
roll up. Here's my version of a Dung Beetle, made of Marzipan, to roll away your truffle center.
I've used my friend Ryan's truffle recipe for the 'Dung Ball' but you can use any hard to the touch truffle ( such as this awesome instructable
). If you can easily pick it up, then you can use it for a dung ball.