The blue ghost was produced from a normal het. ghost and a honeybee. Mark also said that she's been getting bluer with each shed. Gorgeous animal!
And to answer someone else's question, those were uromastyx.
Overall, the show was smaller than their fall show but had a lot of neat things there. I took a friend of mine who's never been and he came home with a leopard gecko while I came home with my first ball.