i've been contemplating crossbreeding of species for quite awhile.
i have looked around and contyacted many breeders who hybridize snakes and a few who cross breed lizards. 90% of the cross bred animals are snakes because their habits are so similar and can be confused be senting to cause or induce breeding. where as lizards breed by site and just simply hormones (i think) but i do know they go more be site.
if they were closely related like beardies and lawsons dragons or a mali and a morrocan then you have a good chance because they will look very similar and when they come out of brumation in the spring may very well breed.
i have spoken with Doug Dix about cross breeding and i found out that he too is trying to cross some to gain more studry captive pets, also, ones with more color.
i will be attemping to cross some as soon as i decide wht ones.
i'm thinking a mali and a morrocan to hopefully get the blacks into the morrocan pattern. or whatever.
just my thoughts...hopefully you can understand all of it 
trevor
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Trevor Bennett
E-mail: yruemailinme15@yahoo.com
yahoo SN: yruemailinme15
location: Salem, Oregon