I checkered my 7x57 rifle a few years ago after purchasing a dem bart kit from brownells. It is a tedious process and takes a great deal of time, patience, and a steady hand. Those areas are not my strong suits but I do think it turned out pretty decent. I don't have a pic of it handy at the moment but if I find one, I'll post it later.
I plan on checkering my 240 wby stock whenever I get around to finishing the unfinished projects on my work bench.
I've found, for me, the less complex patterns are the best route. I used a pre-64 Winchester checkering pattern for my 7x57. Basically I just found pictures online and created my own template. Then I used a pounce-wheel to transfer the pattern onto the walnut. I've heard harder woods like maple are more time consuming and harder on your tools, but I have not attempted a maple stock, yet. I think another good pattern is a Ruger number 1. Looks classy and stays simple.