Dresslars book has afew indian horns.I recently carved the micmac horn from the book as my personal horn. There is also a choctaw horn Ive seen with vines relief carved on it. But Dresslars book is the best source Ive seen. Ones listed as indian: Chief Paugus Horn, 1748 face horn(appears to beindian),Jonas wood horn, indian influenced at least, the Seth KArenhargowagh Horn, fought with jos. Brant, Indian trade silver horn.The Beuachamp horn, indian made with later additions,King sacket horn,1785 indian horn and the Micmac horn. The book is quite expensive so borrow a copy to see if anything trips your trigger. Also online the American Museum of Natural History collections include some indian horns but pic are too poor to get any good scrim ideas from. Horns were traded, horns made and horns captured. Hope this helps you