Priced out some rowmark, holy crap that stuff is expensive.
Decided to try some DIY and it worked out extremely well.
1) spray painted colored acrylic. worked great. you definitely want to wait for the paint to completely dry or you'll easily imprint fingerprints on it. any color combination you want, including ones rowmark doesn't provide.
2) spray painted HIPS. worked even better. paint seemed to slightly melt the surface of the HIPS and fuse to it. downside - only white hips sheets available so only white for engraving.