My first thoughts for your BB are about roping. Cover BB surface with bandanas. Trim your BB with rope (bailing rope, sisal, whatever). Fashion a lasso and "wrangle" some of your favorite book titles on the BB. Include a construction paper split-rail fence. Maybe you could also hang a cardboard wagon wheel, then use inside sections of the wagon wheel on your BB to earn class or individual incentives: "fill up all the sections and you'll get ___."
I used this a classroom theme a couple of years ago...
Reading Round Up
Buckaroo Book Log
Kids earned Buffalo Bucks
Reading nook had a real saddle they could sit on to read
How I Spent My Summer Vacation (Teague) is a good picture book read aloud
Mrs. T's Most Wanted... Readers, Read Alouds, fill in as you please
My mind is going blank now. I have more ideas at school. Check the Proteacher archives. There are lots of ideas there. Slogans listed might help get your creative juices flowing...