Warm up routine

Looking to develop a warmup routine for my 4th grade team. Warmup times differ from 5 to 15 minutes usually. Just looking for something besides lay up lines or a pass and cut drill. Iour travel program has lost some court time this year so I do want to utilize any extra court time to work on skills. I wouldn't do drills they haven't done in practice, but maybe go beyond the norm of what I grew up doing before games.

What do you for warmups?

I assume you mean warm up before games? And not a warm up before practice?

Here are a couple ideas for warm up before games:

Triangle pass and cut
https://www.breakthroughbasketball.com/play.asp?id=70

Shell drill
https://www.youtube.com/watch?v=t9GWqQI-XVM

2 balls, 3 shooters (modified version)
https://www.breakthroughbasketball.com/play.asp?id=8032

Circle dribling and lay ups - Everyone has a ball. Line at half court on right side facing basket. Line on left baseline facing midcourt. Players can speed dribble of make a few moves at comes. Players going to basket shoot lay ups. Players going to mid court do a jump step and pivot. Then they go to other lines. After a couple minutes switch directions so everyone gets left lay ups too and left hand dribbling. It's very similar to this drill except you just work with one basket.
https://www.breakthroughbasketball.com/play.asp?id=7934

Pretty cool pregame warm-up drill that our local varsity girls use, and I stole and implemented with my 8th grade boys - half court three man weave, last pass leaves the ball on the ground at the circle and retreats and plays D vs. the other 2. So half court three man weave into a half court 2 on 1 coming back. Gets the kids into game mode where they're attacking the basket and taking shots under pressure, get some contact going vs. just shooting.