Plant Something and Wait
One pot, a few seeds, and a reason to look out of the window every morning.
A tally chart, a window, and fifteen quiet minutes.
A genuinely calming activity that needs one sheet of paper and produces data they can compare week to week.
Sustained quiet observation is a skill that almost nothing else in modern childhood practises. The tally chart turns waiting into data collection, which gives a restless child a reason to stay still.
None needed.
Keep the charts together so the comparison is possible.
One pot, a few seeds, and a reason to look out of the window every morning.
Not a craft. An actual dish that the family eats.
Sit still outside, close your eyes, and draw every sound you hear.
Two minutes each morning, and a month of real data by the end.
Teach them a game adults actually play.
Walk your road and draw it properly, to scale, from memory.