I saw in a magazine that a friend's child left laying around, that there is a TNMT version of Monopoly, which is, honestly, not at all surprising. Turns out though, the game comes with six pewter figures, like so:
Now, I'm not expert, but assuming that the die in that shot is standard size (about 10mm), then the figures may be almost perfect for gaming. The quality looks a little poor but perhaps something can be got out of them with a little work.

Thoughts?