Ideas: designing a magic garden, collage with pics from seed catalogues, sprouting seeds mung beans etc, making egg & cress sandwiches with the cress you grow, making bird boxes, making fat bird feeders [not for fat birds but with fat & seeds & stuff in paper cup with string to hang up], collage with different types of seeds, painting/decorating flower pots, planting bulbs in pots, making ladybird house, that should keep you going for a while. Good luck with the little Elfins - ahh bless