MAKE A KAABA! Grab a box, some black paint or paper, and get creating! (Check out the link for an idea on how to do this.)
This can be a perfect tool for teaching them the difference between this Eid and Eid-ul-Fitr, going through visually the steps of Hajj, or just as a decoration in the living room :).
There are many tutorials on the internet if you’re stuck – just have a look and then get going!