Jellyfish in a bottle. Gloucestershire Resource Centre http://www.grcltd.org/scrapstore/
Make your own Super Bouncy Ball
How to Grow Crystals Geodes - A Cool Science Experiment for Kids
Glow stick jar I tried this myself, and it actually works. Don't add water though, because it ruins it.
Science experiments you can do in your kitchen.
DIY Confetti Vase how-to. earlier pinner: "Looks fun to do and to see finished. For a little ones hair things, so many possibilities. I like these for a party bowl"