I saw this idea and thought it was a fun idea to get little ones to discover shapes, colours, numbers or anything else hidden underneath the salt.
It was easy to put together - you just need:
A baking tray (I used the deepest one I had to avoid too much being flung over the sides!)
Packet of salt
Coloured paper sheets
Sticky tape or glue
White shapes (or numbers)
Overlay the coloured sheets until you have a section of each showing to make the "rainbow" effect and stick together, making sure it will fit within your tray.
Stick your shapes or numbers on top.
Pour the salt on top generously and let them loose with a dry paintbrush!
DD loved discovering all the shapes hidden underneath, and kept her busy while I made dinner that evening - result!