I want a notification medallion

I may buy an Oppo N1, in part because it will come with Cyanogenmod, and in part because believe it or not, such a ridiculous set of specs is actually more in line with what I am looking for. But that is isn't what I want to ask for, rather, I want a better O-Click Control (scroll down a bit into the features).

One thing I missed about the Nexus One was the glowing button. I used an app that would change the color based on the kind of notification. To have it external from the device serves my purposes well, because I am moving into a new intentional style and awareness where my devices assist me in being more connected to people around me, and only show up when I require them. That is to say, it stays in my pocket, but let's me know if Susan is calling/texting me.

I sometimes wear bracelets, and love the idea of having a small dangly bit that glows when my device is trying to get my attention. I don't want a watch, smart or otherwise. The smaller the better. What are my options?

Oh, I still totally want a notification medallion!