I'm taking another on line class called Fine-Art Grunge Compositions, given by Sabastian Michaels.
Kim Klassen recommended the class and I'm into the 2nd of 4 module now and have found it terrific.
Module 1 is mostly a overview of how to use Photoshop & Lightroom. Working through the videos in Module 1 (there are over 60 in total for the class) was a refresher course for me and well as picking up some new tips.
I'm now starting Module 2 and completed one of the suggested assignments.
I started with this photo which I found on Deviant Art.
And here is the finish page.