Recess outside, for 30 minutes.
Time for lunch AND another recess after.
Hot lunches, freshly prepared, no convenience products, no sugar or white flour (yeah, yeah I know, but the OP said "be creative", not "be realistic".)
Home rooms grouped by age level, academically and socioeconomic ally integrated, but with readiness clusters (see below)
Montessori style individual work periods in home room, with assignments from readiness grouping.
Group projects in non academic subjects in home room.
All academic subjects strictly to be taught in cross grade readiness grouping. Need not be synchronized - not all students have to be in home room at the same time all the time, just for "project times".
Limits on age span in cross grade groups, eg three years - as in "have to open another group, not limit access"
All kids to be placed in home room in clusters with at least three other kids from at least one academic readiness group.
Arts and music for enjoyment, no grades.
No written homework assignments - all tangible work to be produced in school, homework may only encompass stuff such as reading aloud, times tables, memorizing poetry etc.
memorize poetry and sing songs. Lots of it.