I have found 2 fast codes for changing hue/saturation of my custom skin.

Advanced Graphics Routines 3.3 : Superfast but it relies on a C++ dll. (The author didn't give full source of the dll. I haven't checked if the dll source has the Hue changing source or not.)

vbAccelerator NeoCaption Component v2.0 : Good code, but somtimes my system simply restarts when I run the demo.

Anyone knows of any other fast code to change Hue/Saturation of an image ?