If I might make a suggestion, have you checked the online Library of Congress photo archives for an actual picture of how a Native American quiver looks?  When you find a good, clear picture of an actual NA quiver, I would suggest downloading the pic and fiddling with it till you can map it so you have a correct item.  Also, each Nation has different traditional forms for all their gear.  Please don't go with the television "Injun" look, we find it insulting.  For a generic fantasy quiver, it looks pretty decent so far.