<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Going on route 19 you will see “Hawaiian Graffitti” where people take dead coral and spell out names and messages into the dark lava rocks ... </font>
There are actually coral artists who are sometimes hired to make corporate logos out of the coral to welcome conventiongoers. I've seen some pretty remarkable works such as the Coca Cola logo complete with the wavy lines.