I have installed many structures in schools – the schools usually want an area for the children to sit with shading. This has varied from a ‘living willow dome’ to an ‘outdoor classroom’ as seen on TV on a program called Garden Heights. Sometimes schools and children’s nurseries have a ‘living tunnel’ which is a lot of fun for the children to run through.
Willow is also a lovely material to explore and experiment with for sculpture. This is an ideal medium for 5th and 6th formers.
For big projects, it’s worth looking into funding which could be available, or local company sponsorship.
For obvious reasons I do not post pictures of school workshops.