First, that is the most interesting looking Cham I have ever seen 
Ok, now for the serious part: You are going to need to post a little more information. You are saying that you aren't having any luck, can you be more specific? Are they sick, are they dying? What are you feeding them? What supliments are you providing, what lighting (UVB) are you supplying?
Second, you mentioned having a pair of veiled in one cage. How big was the cage? Veiled don't do well together, they are solitary animals in the wild and like to be the same in a cage (Unless your cage is the size of a green house). Also, you mentioned a 10 Gallon tank. Besides the fact that a 10 gallon tank will never be large enough for 1 full-sized vield, any surface that can give a reflection is also back because the cham will think there is another close by.
If your chams (depending on species, I'm going off the veileds) are always brown, that is an indication that they are stressed. Something in the environment is not what they are expecting/what they like.
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1.0 Bearded Dragon (Charlie)
0.1 Corn Snake (Diamond)
1.1 Felines (Blacky and Princes)
1.0 Canine (Skeeter)
2.0 Cockatiels