My daughter was forever walking around with shoes on the wrong feet and even when I would tell her, she wouldn't change them. She was a bit stubborn or lazy, I am not sure which (actually she had both tendencies at different times).

Kids Activity Blog has one of the best ideas I have seen in a long time. How can kids tell which shoe goes on the right or the left? I have seen parents put colored marks on shoes, drawn arrows on the soles and other crazy ideas. This sticker idea inside the shoe is one of the best ideas ever! So simple. So smart. So efficient. And I know the kids will love it. Not only can they tell which foot the shoe goes on, but if a friend has the same pair of shoes (and yes this does happen more often than you would think) they can easily tell them apart.