Tacky, sure, and I didn't do it in pure white because I thought it would stand out more, but here's my Dictation key until someone actually comes with the idea of actually selling them to us.
That's awesome! Would you show us the process of how to make one?
Well, I have a Polaroid PoGo Printer that prints out photos you can stick on whatever, so I just made a 2x3 print on that.
I took apart the icon from this tutorial and made it simple. Then I resized it a few times so I wouldn't have to print over and over again. Then I cut it out as a small rectangle and peeled it off and trimmed it a bit afterwards so it would fit better.
You don't want the sticker too thin, otherwise it probably wouldn't come off if you needed to take it in.