To combat this, Purple Tinker has opened up a new store, with all new shoe designs. In an attempt to avoid any copyright issues, she has taken off the cutie marks and just kept the overall color scheme. (The Purple Tinker shoe above is an exception!)
But fear not! For these shoes are canvas shoes, and a simple guide (found below with the new store) will allow you to add any cutie mark you want.
As always, all proceeds will go to Charity.
New Pony Shoe Store
Canvas Shoes Iron-On Guide
High Resolution Cutie Marks (You can find more on DA/Google for other ponies)