I found a old pair of wedges sandals inside my sister's closet, so I bought a neon spray paint and created a new pair of shoes. I used a normal jute rope to decorate the heel, however there are many different kind of ropes (shapes, colors) that you can use and create something more original on the heel.
*FIRST: remember to use the spray outside and you should wear a mask as well.
*SECOND: if you are using a dark color sandal (like mine), first you should use a white spray paint, and then apply the neon color. You might need to apply several layers before seeing the final result.
*THIRD: Have fun!