A few warnings:
1. Chickens need to roll in the dirt. So beware that your flower beds will destroyed if they can get in them!
2. They will eat bugs! Yay! Except that they will dig up your plants to get at the bugs!
3. Their poo makes great fertilizer...for flower beds not vegetable gardens.
More info on Buff Orpingtons
More info on Silkies
Photos are when they were younger.