Back when I was making my ork army I had a huge surplus of copters and didn't really want to play 10 of them. So I decided to make some warbikes out of the parts. After converting some trucks and battle wagons I had spare tires but not enough to put 2 per bike. Because of that I made skidoo type machines that would partially roll and partially slide.
Each one ended up a bit different so I painted them all different colours. Each ork has his own favourite colours you know! My favourite though is the one with the tau gundrone following for fire support.