Observe plants growing in the surrounding area and identify what is required for health.
Ask for donations of old tights - they don't need to be new as 'faults' will add character!
Tights should be cut up into sections ready for making your grassy creatures. Tie a knot in one end of middle sections of tights.
Small sections of nylon tights
Felt or other materials to create features
Points to consider
Offer a selection of coloured tights for diversity.
Choose different 'growing materials' and assess which is best for a grass creature.