Mine may not be as quaint or fancy as some, but I built it using mostly pallet remnants and privacy fence boards with my total cost being under $100. The attached site shows the step-by-step construction process.
http://s1146.photobucket.com/user/rarob1dustcover/library/coop?sort=2&page=1
Shown below is the recent 30' x 6' add-on run which was mandated after a year of my flock of 9 hens tearing up my St. Augustine lawn.
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Because chickens love to forage and scratch and dust-bathe, we divided the backyard with a rabbit fence. The chickens have their side to dig up any way they want, and we have our "people" side with patios, furniture, veggie gardens, and container pots. We still get to enjoy the yard and watch chicken TV without them pooping on our side!