I suggest you create your basic images using grey scale, then -tint the greyscale to what ever color the user wants.
See http://www.cit.gu.edu.au/~anthony/graph ... olor/#tint
The primary grey color should be the pure midtone grey. #888
also instead of tinting you can also use the 'Overlay' alpha compositing to color the grey using any image or patterns you like. See...
http://www.cit.gu.edu.au/~anthony/graph ... e/#overlay
If you come up with something of interest please let us, and especially me (for IM examples) know.
Colored Gradients and Rounded Corners
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