River tattoo is a Mendhi spine and shoulders tattoo, Omega appliers. Available as hunt gift for Evil Bunny 7 by Evil Bunny Productions.
Hunt hints, locations and more can be found on the organizers webpage, visit http://evilbunnyhunt.blogspot.se/p/hunt-hints_7.html.
Teleport directly to Deluxe Body Factory skins in Second Life: http://slurl.com/secondlife/Hidden%20Village/171/85/1142
Happy hunting!