ok, how about Flags/penants for areas - use words like "play book" maybe for math straitagies... definate red flags for behavior...are they going to call you coach? Long jumpers/track and field when you study measurement.
omm make board games using basketball court. Get some pom poms for spirit before you take a test
Learn some chants.
Some baseball bags use red electrical tape for the diamonds (square pillows for bags) for the reading area. ... some cheap turf for your area ...you can use dry erase markers on green chalkboards - draw a soccer field or football field use a damp sponge to clean. hope those help to get your wheels turning!