Im starting to think about this as well since my oldest has a few toys I don't want the baby getting ahold of and both girls love art supplies. Crayon in baby's mouth isn't something I want either.
Heres what Im thinking of
if baby is awake and in the room small items and art supplies must be up off the ground
if baby is awake and not in the room then small items/art supplies may be on the ground as long as you pick them up when baby comes into the room
small toys/art supplies are banned from my room since baby spends quite a bit of time on the floor in there in the mornings and I don't want something falling where I don't see it but baby does
if baby is asleep then anything can be out with the understanding that when baby wakes up they go back up.
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Honestly I don't see a problem with getting the older ones to follow these rules. They both think playing with their brother is a special treat so for now at least just having him to play with is incentive enough to keep things cleaned up.