You need two cards which are roughly the same size. I only use the fronts of the cards so I need 2 cards for 1 box. If you use the back of the card too then you only need 1 card per box - you with me so far?
Cut the cards so that one is a few mm smaller than the other. The smaller card will be your base, the larger one will be the top.
Mark a line on each edge. This can be any distance but all the sides must be the same. The further the line is from the edge the taller (but smaller) your box will end up.
This card measured 16cm x 15.5cm and I measured 3.5cm in. The box finished up approximately 9cm x 8.5cm x 3.5cm.
Cut where shown here:
It's a good idea to cut the top one way and the base another. This photo shows what I mean:
Put glue on the right side where the big red blobs are here (I had to use a fat permanent marker pen here as the card is shiny - I felt very "pulp fiction" as I drew the big red blobs! You don't put red blobs - you just put glue)
Fold the gluey sides up and stick in place to form the box.
Then hold in place with clothes pegs until the glue is dry.
(This is upside down, the red is the top and the black is the base)
Easy as that!
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