Any thoughts?

Im totally blank here. First I was thinking maybe something to do with Jail Bars, or the uniform but I just cant put it together. Nothing 3d, but maybe a sheet cake.. Im lost.. Any ideas with be appreciated.. Thanks..

It might be a bit cheeky , but what about a basic cake with a metal file going through the middle of it....you know, as a joke? It would have to be really obvious, not hidden or anything.

The inscription on it could be something like "Heard you're getting out soon" or something funny like that.

How about a set of handcuffs, with the inscription: Your Time Is Up - or - Parole Granted.

- OR -

A copy of a Monopoly `GET OUT OF JAIL FREE` card covering the whole cake.