I like the idea of having your players do 2-ball dribbling in an athletic stance as a 5-10 minute warmup to practices. I usually liked to have a dynamic warmup but I think for practices, it might be better to just do dribbling instead. With butt down, holding their athletic stance and doing 2-ball dribbling is probably just as good anyways.

This is a great video on a bunch of ball handling drills by Ed Schilling at a Athletes in Action Basketball Camp. He starts out with the 2-ball dribbling warmup and moves up through to a bunch of ball-handling drills he uses for player development. It's a long video, about 1hr 10 minutes so if you've got some time to kill, click away,