This PDF from the BBC Comedy Classroom has tons of useful "items" one should always have in their comedic toolbox. Think about the items you already use. What would you like to start incorporating into your improv scenes?
You all were fantastic at the Team Props game – Here's an amazing montage of the classic WHOSE LINE IS IT ANYWAY team performing a similar game. Enjoy!
Here's an excellent video essay on silent comedian, Buster Keaton and his "Art of the Gag" – Not directly related to improv, but it does offer some amazing tips about comedy, timing, staging and blocking.