Painting the camera invalidates the warranty as it changes the way the device deals with heating caused by sunlight. Even if you don't want to keep the camera warranty, painting a camera black and then using it in a sunny environment will cause it to run much hotter. This could lead to early failure of the hardware.
@NFL0NRit seems like heat would still be the issue. If you were looking to disguise or hide an indoor camera I would think some really light porous foam or mesh would be the only thing to not trap heat around the unit. As far as outdoor cameras go I don't think there is much that wouldn't effect the temperature of the unit.
@NFL0NRI hear ya, didn't mean to discourage the suggestion. I'd love to throw an MV71 under a giant Vikings helmet Fathead in our server room if I could
@NFL0NRhaha sorry, saw the GB logo and couldn't resist. I'm definitely a Vikings fan but to be fair they need all the help they can get, hidden cameras included lol.