I've got a few colored firearms. FNP-45 Tactical is in desert tan. Also got a Mossberg MVP rifle in a tan color from the factory. My FAL has a camouflage finish as does a CZ shotgun.
Not into the zombie or marketed-to-women color schemes, however I don't fault those that are.
I am considering a Texas Flag themed paint job for my .300 BLK rifle.
Glad to see the creativity coming out with some in their firearms overall appearance. Whatever makes firearms more appealing to more people I see as a positive. So, for me, if you want to make your firearm a work of art, whether by engraving, inlaying, painting, coating, hydrodipping, color case hardening, damascus parts, etc. go for it.