No offense but this might be the 20th time this question has been asked on this forum in the past year or two. So search!!
Yes, you can paint it and yes it will somewhat change the acoustic properties of tile alone but most here have a painted sheetrock ceiling...so who cares about the slight change I say. Colored tiles are more expensive and require special orders.
Or see what colors are available by going through a specialty distributor. Armstrong has black tiles (maybe other colors as well) that can't be ordered by home stores. I got my black 2'x2's this way and they ended up being cheaper than most of the plain white tiles at the home stores.
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