I saw the idea for these little mini graduation cap straw toppers at LilLu and I had to give it a go. I didn't have a glue gun at the time, so my steps were a little different, but the outcome was the same. You could also grab colors to fit your graduations needs.
I curled it around and then folded them down. I cut out a little triangle and used these flatted tabs to glue to the top of the square. I cute a criss cross slit in the top to push the straw through.Here is a free template if you are unsure of the size to make these.
Easy. Cute. Practically free!