I think this is the second topic today that asked for advice with no pics. I assume you want general ideas. I'm with the idea that you don't know a lot about the Word Bearers, if you do then please don't be insulted.
Just in case you haven't checked it out, this gives you a pretty good overview of the legion and two images to use as inspiration:
http://wh40k.lexicanum.com/wiki/Word_Bearers
The two biggest earmarks of the
WBs that I can think of are scripture on their armor and flames. You can make either one with a little greenstuff. I remember a dark apostle conversion with little braziers where his backpack vents should be. In the last codex they were said to be religious fanatics who used lots of daemons and chaos marine squads with no cult troops. They're the only legion that didn't murder its' chaplains, so a leader converted from or made in mockery of a loyalist chaplain.
This might also be a good idea, especially for squad champs or
HQs: Doghouse's gothic marines
http://www.bolterandchainsword.com/index.php?showtopic=90388&st=0&start=0