Tint the screen

How would you go about tinting (coloring) the whole desktop (apps, startbar, basically the entire display) in real time, i did a long google but nothing much came back. you could of course take screengrabs and color it that way but it might be slow working on laaarge images.

i think i might have to use some GDI stuff...

What about drawing a rect the size of the screen after everything else with blend or alpha? I haven't tried myself, so its just an idea that might be worth looking at.

thats not a bad idea actually

What Zawran said is probably the best idea. However, depending on what you're drawing just using SetColor to a value other than 255,255,255 when drawing will have a similar effect.