Hi Everybody,
I built what I think is a pretty great Graphics 2.0-compatible Color Picker that can be inserted into any Corona project with just one line of code - I borrowed heavily from StarCrunch's Code Exchange post from last year (http://developer.coronalabs.com/code/color-picker), but I think I made enough improvements to say my picker can stand alone as a separate product, including the addition of an alpha channel slider. The code is free to download, modify, and use as you see fit. You can read about it and download colorPicker.lua or a sample app that shows it in action at http://www.jasonschroeder.com/2014/03/24/add-a-color-picker-to-your-coro...
Here's a video preview of how it looks in use: https://www.youtube.com/watch?v=r9nZzovrPbk