Chicken run design ideas? Please give advice or show pictures.

[CDennis]

Until this year all my chickens have been a mixed flock with access to a barn and large coop (floor is 10 by 16 w/ 9 foot walls). This year I have plans to split off into some breeding pens, since what I incubate right now are all muts. We have 6 acres so space is not an issue but I am at a loss as to how to design these runs/breeding pens. Of course they will all need shelter and a nesting area, but is there an economical way to produce pens? I would love some advice.