Today I made a Bitcoin monitor app for the Sony Smartwatch 2. That's probably as niche as it can get with 0.01% having bitcoin and 0.0001% having that Smartwatch but I'd like to share it anyway with you.
I bought a Pebble and a Sony Smartwatch 2 for other projects and noticed that since then I'm only pulling out my phone to check the bitcoin price action, so I made that little app and guess it's quite ok for a one day project with market release (at this moment not yet listed in my market apps. Might take some hours.), video and bitbucket repo. Yes, it's open source, so if you don't like it, send me a pull request and I will happily improve it. Also if you happen to have a Smartwatch 1 (how many people do at all?) or some of the other Sony gadgets, maybe it would fit in there, too.