I used some of the suggestions on these forums to paint these.
I first sprayed a clear matte sealer on (so the ink and paint will stick to the mini) then doused it in purple ink, then dry-brushed with 2 shades of pink (darker one and a lighter one) and then I hit them with a small amount of white.
Still retains some of the translucent purple effect. Good for a Ghostbusters game.