Measure your cardboard depending on how big you want the ribbon to be.
Cut the edges to a scallop motif with scissors, i cut it freehand, to achieve a neater scallop you can draw it first with pencil
Start folding front and backwards, folding line start in centre, hold it , try not to fold so much towards the edges to achieve a neater bow
As you can see towards the edges not so much of folding line, this help to open up your bow
Hold the centre and tie a ribbon, can be any color to match
You can add hair pin, just slot that in to the gap
Voila! You can accessorize your hair or other things. Be creative and enjoy! ^^