I dont have any other pics at the moment as all the other capes that i have made i have either sold or given to friends.
The cape on the ARC trooper was black, i started with the light blue the lego cloth seems to absorb the paint in a good way. I rubbed it over twice with the paint each time i used a very very small amount of paint.
It does indeed work with white paint ive used it on a black cape, the result was great.