For Raspberry Pi prototypers, it's sometimes hard to remember which GPIO pin is which. That's where Dr. Simon Monk's Raspberry Leaf comes in handy. This simple piece of paper that can be printed at home goes over the top of the pins and reminds you which is which. You can see it in action below:

It's these simple ideas that can make people millions. Luckily, Dr Monk is part of the DIY community and is releasing the idea and template for everyone to use. You can download the image file and print it out at home from Dr. Monk's website.