Put your sweater on and mark where your elbows are with a piece of chalk or fabric marker
Decide on the shape you want your elbow patches to be and make a paper pattern
Use the paper pattern to cut out your patches
Pin your patches in place, centered over where you marked
Then hand stitch the patches in place! I used pink thread for an extra fun touch :)
And there you have some elbow patches for when you're feeling fine and fancy!