Yeah, it can make for an interesting learning project!
I've used it to practice with the Lightroom local adjustment brushes -- on this shot I lowered the saturation in all the color channels and then used a brush with Saturation for the Reds cranked up and then another with Saturation for the Greens cranked up and then just did some brushing over a couple areas and came up with this -- not a great image but it was fun:



