Rice bucket for rehab, injury prevention and strength training?

I recently sustained an injury to my ring finger from hangboarding (i think 2-finger pockets exist solely for the purpose of injuring) and in my cabin fever madness I recently got a five-gallon bucket full of rice to start using. I've played with and am feeling like it could be a great tool for a ton of purposes. With my good hand I've done different exercises that I've been coming up with (finger gliding, etc) as fast as possible for recruitment (sets of about 45 seconds or as much as I can handle), and with my bad hand i've doing some work with oppositional muscles, low-intensity to rehab and keep ROM and hopefully prevent some losses in strength.

Has anyone here ever used a rice bucket in any capacity, and if so, do you have specific recommended workouts, exercises, sets, volume, anything? As of right now I've just been experimenting but I'd be interested to get any feedback on others' experiences.

We did it some at a PT clinic i worked at. I don't remember the protocols though. most likely by time.. 30 seconds for a few sets, 45 for a few sets. etc

silly putty is also good depending on the density of it. theraband makes different strengths. might be able to find variations at a craft store.