Blue tongue skinks don't need fruit. Fruit should make up no more than 10% of the diet.
Here is the best forum:
bluetongueskinks.org (same thing as Bluetongueskinks.net )
You can feed an all dog food diet.
Mealworms are ok to feed BTS's but would be bad to feed on a large scale.
I would...
Uromastyx or spiny tailed lizards are from the desert and require high temps. Some are extremely dark:
http://deerfernfarms.com/Uromastyx_Ebony.htm
http://deerfernfarms.com/Uromastyx_Mali.htm