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I don't think color matters either as it is outside and not inside. I'm going to use black.
Lowes and Home depot both sell window screen material and or shade cloth with different light blocking abilities. It would all boil down to as how dark you want it.
I plan on keeping the screen
off the glass at least 1-2" and painting the frames to match the roof.
Also, maybe add some large drain holes at the bottom of the frame to allow rain water a way to escape might be a good idea as if water were to back up, it could cause a water leak issue with the skylight. Then just cover those holes with some more screen material so the bugs can't get in easily.
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