Firstly try to trade them on the classifieds. Lots of people would likely want tan magazines. A new box of King Arms mags (box of 5) is usually only $50 - $60 or so as well.
For painting mags, do not paint the part in the mag well, just in case. At the very least your paint won't last as long on that part. Use Krylon camp paint available at Canadian Tire, and gently scuff your magazines first. Do not get any paint near the feed lips/BB port. Do at least three even coats.
Consider grabbing more tan furniture for your gun to match, it'll break up the black, and help to hide your gun.
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