Mia you can still do the fold and crease method, if you simply fold over the corner on one end it will still give you the equivalent of a 2.5" square fold but with the extra bit hanging out one side, the square area will be 2.5". Your only thing to watch is which direction you are folding/creasing at the end as the orientation of your strip needs to be right. If you take two and do one in each direction then you will have what you need for each leg. I will see if I can draw a picture or something.