I found some free templates online and made them different colours.
I have made the PDF files editable if you have Illustrator, you could change the colours and text!
All you need to do is print out the 4 PDF files, onto white card.. you could even use stiff paper, then using a cutting knife or scissors, cut them out, and glue them together, using the tabs.
Click these images to view, and then right click save as.
The base should look like this once put together: