Hi, if you reach this page you have probably been searching for muleos - replacement shoe straps.
This item is now discontinued but you may find the following products usefull.

http://www.debzcrafts.co.uk/detachable-shoe-straps-and-blingbacks-shoe-jewellery-294-c.asp

Or Eliza May Shoe straps here
http://www.debzcrafts.co.uk/new-eliza-may-detachable-shoe-straps-417-c.asp