Baseball as we know it has basically been around since 1845. It had its origins in a British ballgame called Rounders. The Cincinnati Red Stockings became the first professional team in 1869. The idea of paying the players caught on. A baseball theme party can have focus on a favorite professional team or just having fun with the game. Baseball party supplies like paper plates, napkins, and cups are a nice way to complete a baseball theme party. Party decorations like real baseball bats and balls can make fun centerpieces that double as party prizes. Party favors like baseball cards fit a baseball theme party.