If you want to do more advanced routines with this trick, all you need to do is to switch the wooden egg for another item. After you produce the egg, you can put the wooden egg into your pocket and secretly switch it for another item, which you then produce out of the mat.
IDEA: Make the egg vanish and reappear several times. Finally, make the egg vanish, fold up the mat- and pull out a LEMON!
IDEA: Make the egg vanish and reappear several times. Finally, change the egg into a WHITE SILK!
IDEA: Show the mat empty, then produce an egg. Put the egg into your pocket, or into a hat. Produce another egg, then another and another, showing the mat empty every time.
IDEA: Make the egg vanish and reappear several times. Finally, produce the egg one last time, and CRACK IT OPEN INTO A GLASS to show that it is a real egg!