I would like to see vendors offer a selection of colors for the regular atomizer tips, including the 306. When I use a drip tip, my atomizers acculmulate gunk inside including hay chaff and paper dust and of course the dreaded pocket lint. I had been using cartomizers but switched back to atomizers. The black tips on the 510 is not bad, but I really do not care for the yucky orange of the 306. Wouldn't a selection of colors be nice?