I haven't used clear glass in any facial piercings, but honestly they tend to accentuate the hole (at least, in my eyes). you could use glass retainers and paint the tops with a flesh-tone nailpolish but I don't know how effective that's going to be for your more visible piercings (cheeks, esp.). for those you could try a barbell with acrylic flesh-colored dome (I know industrial strength makes them, I'm not sure about anatometal) though, as many people have pointed out: if they're fresh piercings, changing jewelry isn't a good idea.
if this is for a job, you could try using small band-aids -- I know a few people who have been able to just cover their piercings (regardless of how obvious the coverings are).
and if these are your friends ... find new ones, man. I don't expect my friends to love everything I do with my body or my life, but they should at least be supportive of me doing what makes me happy (provided it's not dangerous or really stupid). good luck.
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8g lobes (6g goal size)
right nostril
bunny tattoos! : D