Recently, someone posted pics where they RIT dyed their tarp. I believe they used two or three colors in the process. It seemed to have favorable responses. I don't know if there was a longevity report to see how it weathered - pun intended - the exposure to the elements. Maybe someone can track the thread down and holler at the OP.
Sarcasm is a dying art.
Eagle Scout September '85 Troop 339 Smyrna, TN