Concertina books … Have fun with squares, rectangles, circles!

Ever wondered what to do with oddments of wrapping paper, patterned envelopes, prints and paper?
How about having a go at making one of these? They’re easier than they look.

The mini one requires 8 squares measured at about 8cm across; the spiral book requires three A3 sheets cut in half lengthwise.

If anyone is interested in a pictorial tutorial, please comment below and I’ll put one together :–). Simples!
The last image, showing the spiral book closed, is part of a pack of happy mail going off to Spain.