I just finished a Bamboo backed Ipe, with osage/purple heart riser and tips. I really like the look of the osage with a purple accent stripe.
I always match tips and riser. I've also done a stack of maple and ipe strips, that looked pretty good.
I followed a Sam Harper build along once and put a Padauk accent stripe in a Zebra riser. That looked pretty sharp.
My next bow is for a Texas A&M buddy, so his will be maple and Padauk riser forthe white and maroon.
I have never had a riser delam with TBIII, but you need to either put a power lam up front that extends past the fades, or fade your thickness from riser into the board, or use a belly lam that extends up the riser some.