When I organized a BOM a few years ago at guild, we did a sampler quilt. It had: log cabin, churn dash, nine patch, Sun Bonnet Sue, four patch, flying geese, dresden plate, pinwheel, and a split nine patch. There was something for everyone. If they felt they didn't want to do a specific block, they just passed on it. Each month was a different colour and every month the name of one of the participants was drawn and they would win that month of blocks. Now, I was lucky... purple is my favorite colour and I just happened to win the month that we did purple dresden plates. Every one really enjoyed this BOM and the final product was beautiful.