We are in the midst of winter, but baseball season will be here before you know it. UncommonGoods has some great looking stadium blueprints for sale. The museum grade digital prints are printed on archival paper and framed in black poplar wood. They don't have every team, but they do have quite a few of them. The measurements (in the frame): 20" H x 26" W.

Buy one for $185. They offer a larger version for $265.