I never know what to do with those chipboard bits.. they always seem a bit too chunky for cards.. but this worked out ok :) Been wanting to try this folded card for a while, its actually v.simple and squishes flat fine for posting. :)
Measurements. 14cm x 14cm blank. 13cm X 13cm matt 11.5 x 11.5 matt 14 cm square, folded into the centre, then out again.