Here are the colour 'tablets' that I made for Z a few months ago when I had just started researching the Montessori method and is the first Montessori material that I attempted to make. It's very basic and I only had to use 2 materials.
Thick Cardstock and Sticker Pad
The sticker pad is basically a pad containing glossy adhesive sheets of different colours.
When I first made these and laid them out in front of Z 3 months ago, she instantly knew what to do and matched them all up correctly. So far she knows and can name the colours green, orange, red and yellow and can point out blue and pink.
Z grabbed the cards while I was photographing the cards today and started laying them out side by side albeit not in matching pairs.
Makes me want to go and buy colour box 3 so that we can make a colour tablet snake together!