1. Buy the MiniFigure Ultimate Sticker Collection Book from Target ($12ish) and poster board. Determine the measurements. I went 8 Minifigs wide and 6 long. Before placing any stickers, I measured distances with a ruler and marked lightly with a pencil.
2. Let the sticker placement begin.
Best part about this book? They give you two of each sticker, so your kid will still have an entire set of stickers to play with when you finish.
3. Once I was finished putting on all the stickers, I erased the lines.
4. Frame it. Perferably in an old frame you have laying around.