I just took the idea of the farmhouse, and crossed it with a bed in a photo my wife found on Pottery Barn Teen.
The back is one peice of plywood, and I just used the planks for accent. The top of the headboard is a 4X4, with a routed bottom edge. I made the crown pieces on the posts out of a couple of routed squares of MDF stacked.
The footboard is quite similiar to the Farmhouse footboard just with the plywood and accent planks instead of just planks.
It was super easy and cost less than $150.