Do something to get you drawings from each student (e.g. Listen & Draw, or Silent T/F Reading).
Project & describe as two students compete to indicate the correct drawing
Silent T/F Reading drawings are ready to go w/ 2 pics on one page, but you could place any two drawings side-by-side under a document camera. Oh, and I know a gal who knows a guy so my doc cam from last year mysteriously showed up again. If you don’t have a document camera, you could scan, and maybe crop/arrange two images side-by-side in Paint or something. Either way, this is easy prep.
Although any two drawings will do, I’ve found that the challenge level is best when you can describe things that are in both drawings, reserving any difference for after some input. Hence, Silent T/F Readings are a great option. Otherwise, if one drawing is a cat, and the other a building, there’s only so much input you could provide before the correct drawing is immediately recognized. Also, I had students yell out “left/right” in the target language and raise the same hand (instead of getting in the way of the board).
Also, this is an excellent way for teachers to become more comfortable speaking Latin. Speaking slowly builds the suspense as students intently listen for clues about the drawings. Even a think-aloud provides input (e.g. “nesciō quid in arbore sit” or “vidētur mihi…” or “in pictūrīs nōn sunt…”).