I've been playing around with the Artistic Filters in PhotoShop. The coolest thing I have found so far is that after applying the filter you can then fade the effect all the way back to Zero.
This is the original I picture I took at the Temple of Tolerance in Wapakonetta. There are several of these Ringed Globs in various places. The shadows and lighting caught my eye.
Just for fun I tried a few filters in PhotoShop and decided I like the Chrome Filter faded back to about 30%.