Insect hotel - Sustainable ideas including an explanation of the materials used, which insects they provide a habitat for and why you want that insect. This would be perfect to have as a project to build with a youth program
Behold the Spun Glass Caterpillar - a real life crystal creature. Pupal stage of the Spun Glass Slug Moth (Isochaetes beutenmuelleri). They are very nearly transparent, and covered in spiny hairs containing poison that can cause dermatitis.