If you want to use more conventional materials, have the children make things out of clay or carve something from a bar of soap.
(the children; carve; something; from a bar of soap) (you; want; to use more conventional materials) Context(you want,List([3, 11))):(you; want to use; more conventional materials)
you want,List([3, 11))
the children you you
carve want want to use
something from a bar of soap
to use more conventional materials
more conventional materials