What you needCard
Scissors (for cutting card)
Pinking shears or scissors suitable for cutting fabric
Needle and thread/sewing machine
2m ribbon or cotton tape (wider than 2cm to make it easiest)
Step one: Make a templateTo make sure all the triangles are the same size, cut a template from card to draw around. I reckon long triangles are better than short stubby ones.
Step two: Draw the trianglesDraw around the template on to your fabric using a pencil or piece of tailors' chalk. Remember to rotate the template each time you draw another triangle so you can get as many pieces as you can from your fabric.
Step three: Cut out the piecesUse pinking scissors to cut around the triangles - this gives them a zigzag edge and stops the fabric from fraying. If you don't fancy investing in any new tools, use normal scissors to cut out and:
a) Put up with the fraying (really, this isn't ideal).
b) Use felt - which doesn't fray - or strong upholstery material
c) Overlock around the edges with a sewing machine