This site is great for Science Education. Sample of an "Atomic Attire" shirt featuring the element Helium. Website gives you strategies on how to organize this project in your classroom so that each student creates a unique wearable science fashion and tips for holding an "Atomic Attire Fashion Show"!
DIY ball run/gravity demo. Older kids could be challenged to create a gravity run that takes the longest without stopping, or whatever criteria your group needs to focus on. Do include data collection such as time recording as they work through their project! You'd probably have to do a smaller version for the classroom if your space is as tight as mine.