Glow in the dark bubbles - open glow sticks & pour them into bubble solution. Link says it's hard to see glowing bubble. but it's worth a shot since they were using a glowing bubble solution not a glow stick.
Homemade Bath Crayons from Little Crunchy Mama: Buy some glycerin soap at a craft store. Melt it in the microwave, add food coloring, and pour into an ice cube tray. Takes about an hour to cool completely, then pop out of the mold and you have crayons!
Had when i worked in a preschool and kids love them! I would use colored sand instead of white salt. DIY salt tray with alphabet cards. Easy to make and kids have fun smoothing out the salt after correctly making the letter
There Was an Old Lady Who Swallowed a Fly- I love using the syrup bottles in the shape of the old lady and the word building in this post. There is also a book There was an old lady who swallowed a bat.