A penny stock typically trades outside of the major market exchanges at a relatively low price and has a small market capitalization.
CorianÂ® is dishwasher safe. CorianÂ® is non-porous so food and most household stains wipe off with a sponge and soapy water. Stubborn stains like coffee, grape juice, ink, hair dye and food coloring rub off with an abrasive household cleanser and a Scotch-Brite pad. Even tougher stains disappear using fine grade (180-200 grit) sandpaper.
The answer to both of your questions is yes. You can paint the Corian to a different color, and yes it can be practical. Corian is made up from a thick liquid solution of resins and pigments that is chemically reacted, then cast into a mold to create a solid material. I recommend using a high quality two component epoxy paint to the counter top.