I just got a crazy and stupid idea last night when I saw my sd card and the lego minifigure. They seem to be mated very well. Here are the steps.
Step 1: Materials and Tools
You just need a mini-figure, a micro sd-card, a double-sided tape and a scissor.
Step 2: Cut the a Small Piece of Double Sided Tape
You just need a small piece.
Step 3: Put the Tape on the Sd-card
Step 4: Combine!
Remove the protective layer of the double sided tape and then sick the micro sd card on the back of the minifigure.
Step 5: Done!!!
Well… Maybe… No one would try to look at the back of the minifigure…