Just wanted to let you all know that I'm sharing what I think is a pretty great color picker library/module. It is Graphics 2.0-compatible, and brings up an Adobe-style color picker box along with an alpha channel slider 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.
I wrote a blog post about it on my own site, with details on usage and a sample project you can download: http://www.jasonschroeder.com/2014/03/24/add-a-color-picker-to-your-corona-app-with-one-line-of-code/.
You can also find the colorPicker.lua library file on the Corona Labs Code Exchange: http://code.coronalabs.com/code/color-picker-color-picker-your-app-just-one-line-code
Here is a video of how it looks in action:
Hope some of you find it useful!