I still shoot carbons and aluminums - haven't crossed over to woods yet (although there is an odd tug each season to try them). I love the look of custom cresting and really enjoy fletching arrows and seeing what I can come up with.
I've always ordered various solid colors from Onestringer.com and then done my cresting with sharpies and a ruler. If you take your time, it really makes a great looking crest. The one issue is that over time the wear and tear on a shaft messes up, fades, or smears the cresting. I ordered "clear" wraps this time and put those over the newly crested ones. What a difference that makes - no more nicks, smears, or anything. Just a tip I thought I'd share if anyone does the same - I believe they call them a "double dogg."
I bare shafted just to verify, and having 2 wraps did NOT change the spine.