[Burnsaber]

Sorry, but I'm busy with bretonnia. Have you tried to take a look at the numereous nation mods floating around here? Some of them are bound to have some serviciable sprites for your purposes (you know if you remember to ask for their permission to sue them).

If I recall correctly, Honeybadgers Ammon Kush had a nice greyish wyrm that could be easily recolored.