Sdgarris, those are GREAT!

I do think I'll try to convert some myself from the fighting 15's/Eureka.
Searching the net has yielded nothing in the way of dark horse ninjas for sale.
The 15's look a lot like the original concepts for the turtles, which were much less human and more turtle. I think I may be able to achieve something similar with the f15's. The standard weapons (sword, nunchako, "forks" and staff) should be very easily converted and the belts and masks shouldn't be that hard either.
Well folks, that's the first thing settled then... now for the next part:
About 1990 there was a cartoon show on the telly called teenage mutant ninja turtle (not hero turtles). It featured beebop, rocksteady, shredder and of course... the extradimensional crook: Krang. It think the cartoon could make for some funny scenarios (with a lot of my friends having dejavus to childhood). The standard setup is almost always "Krang/Shredder needs something done and sends Bebop/Rocksteady/Foot along in a moletunneller to get it. The turtles find out and a fight occurs in which the turtles win."
Now I wonder if anyone has ideas for converting:
Shredder - Spiked up super ninja
Rocksteady - a rhinoman
Bebop - a boarman... I'm thinking about the bonegrinders from HORDES myself. But they're fairly rural.. I would be nice to just chop off one of their heads and put it on a musle man.
Krang - a living brain... often in his exobody-walking-suit
Foot - these are basicly stereotype ninjas
April O neil - a television reporter... there's got to be loads of models for her.
Splinter - I'm thinking using a skaven model from Games Workshit will do a lot of the trick.