Lets Play Ball Sports Party {Boys Birthday} - Take some ideas from this party. Instead of "Play Ball" do "Game On"! Make banners, maybe hats for favors. Similar cake with less tiers.
From L to R we have, McClellan, Waino, Holliday, Matt Carpenter (Pee Wee Herman), Westbrook above him, Berkman in pink, Schumaker in green, Raffy squating, Lohse in blue gray top hat, Freese with Cat in the Hat, Boggs in hunter orange, Greene in span