Here's another simple Valentine's activity! I bought a set of heart measuring cups (for a dollar from Dollar General) and put them in a basket on E(2)'s Montessori shelf. Done!
E puts them in order from smallest to largest. We talk about the different sizes, and we pretend that the measuring cups are the different members of our family. One day she was insisting that the biggest one was O(5)! Silly girl :)