Too many people try to think outside of the box, especially when it comes to product design. I guess they think that being outside of the box will automatically classify their efforts as creative. This belief couldn’t be further from the truth. Good design doesn’t always require creativity. Innovation does. So I guess before starting to design a product you need to decide, “Am I’m designing or innovating?” Once you get that down, you’ll be much more successful with your creations.
A quick example of this might be if you were a shirt designer. You might decide to “design outside of the box” by moving the shirt pocket from the left side to the right. The shirt was already working fine though as shirt users expect the pocket to be on the left side. In this case, you wouldn’t reinvent the shirt, just redesign it to make it look better. Maybe try a new pattern or a different color, but don’t try to innovate the already functioning shirt. You have to consistently use common sense to achieve intelligent design.