Here's the OBW tutorial from this board:
http://www.quiltingboard.com/tutoria...ns-t92503.html
Normally, you would look for a fabric that doesn't have a plain background because depending on the scale of the print, you might wind up with a bunch of solid background colored hexagons. If you are considering the wide backing fabric from your other post, there is a lot of beige plain background but It's hard to tell the scale of the flowers so it might be OK. You can always buy a bit extra and if you get a hexagon with little or no pattern, just discard it.
Here's a thread from a couple of years ago that talks about fabric choices for OBWs
http://www.quiltingboard.com/main-f1...er-t35100.html