To clarify, I'm interpreting that as starting a fresh project within the jam's runtime, not dusting off old project folders.
Would a from-scratch remake or adaptation of an earlier game be okay?
I've had an idea to redo my very first game in a new engine (it was made using Raycasting Game Maker), with a complete visual and gameplay overhaul. Alternatively, I'm keen to adapt a recent top-down horror game I made into different genres; a first-person adaptation would work well.