This object was entered in the MakeShaper Design Challenge (see all entries here).

Childrens flip flops where the base leaves an imprint of a dinosaur foot print in the sand! 

Print would have a 50% infill density to have a cushion effect in the base when the child walks.

Indented in the base of the flipflop is dinosaur foot prints so as the child walks on sand the print will appear!

More designs could be created depending on the design the child may want their foot prints to look like!