You might be able to get a fancy one thru the custom shop at Browning. I'm sure it won't be cheap. Midwest Gun Works also has replacements.
http://www.browning.com/products/catalo ... /index.asp
http://www.midwestgunworks.com/merchant ... de=C-016-1
http://www.browning.com/products/catalo ... /index.asp
http://www.midwestgunworks.com/merchant ... de=C-016-1