Posting my old ballpark sketches in chronological order.
My First Ballpark Drawing from 8 years ago -Twins/Vikings Convertable
Washington Nationals Stadium
Ballpark Mets, Ebbets Field.0.gif
Reincarnated Ebbet's Field
New Oakland A's ballpark
NY Olympic and Mets.3.jpg
New York Mets/2012 Olympics Convertible. This is actually one of my favorite concepts. Would have been good for both baseball (though maybe too big) and Olympics.