Today I had absolutely no inspiration, so I did that thing a person can do when they don't have any ideas but do have access to Photoshop.  I took a random digital photo (in this case of the purple grape juice dregs at the bottom of a pint glass), and just started playing around with it.  I mainly used different selections to create new layers from the background and then invert them or change the hue.  I then added a few adjustment layers and used various sized paint brushes to add patterns into those.  It's sort of a silly project, but at least it got me doing something today.  

And now, far too much later, I'm hopefully finally able to post the thing.  Stupid internet problems!