for hand sanitizer! LEGOs suspended in a liquid soap dispenser. Fun to put out at a LEGO party or everyday use in your kids' bathroom! I'd probably search for a cuter dispenser, maybe more geometrical, but still such a cute idea!
Preschool math - counting around the house. Count the number of doors, windows, doorknobs, faucets, etc. Simple math activity that they can do at home with the parents. Make a "map" at school and send it home.
Fun Math Games to play with your kids - I'm in love with this quote concerning Monopoly: "It’s also horribly painful . you have to sit there for 2 hours watching the other person win as you slowly hemorrhage money.