Okay, that's a possibility, especially if they are trying to produce a more realistic 'stone' look. Every faux-stone painting technique I've seen on HGTV requires an undertone and then the addition of additional colors on top of it.
Please post the photos soon! Very curious to see what's going on! Unless you're busy giving mouth-to-mouth resuscitation to Paul (Breathe, buddy!), then I'll wait patiently until you're done.