Magneta Picks

Early Magneta Pick - which feature bigger holes and a flat, printed logo as opposed to a raised logo.

Ever lost a pick? The Magneta Pick is designed with a neodymium magnet inside so that when you're not playing, you can keep it safe by sticking it on your strings or mic stand (or any metal surface) so that you don't lose it!!!

The magnet doesn't affect the tone at all and is said to possibly be benefitiary to the body by increasing the blood flow:

Made from recycled materials, the Magnetas feature a raised logo for grip (love their logo!)

Customized
They even offer customized picks so you can have your band name/logo, advertisement printed on them and can be marketed as picks or fridge magnets!
I think they'd also be great for things like wedding favours, or stick a magnet on the back and wear as a badge!

To read the original patent, click here.

Click on the logo below to go to their website