Hmm... not only are all them thar wires BLUE ("Excuse me, I need to purchase some 12/4 WG with all blue wires just like it shows here!") but they also show a tip-off of DIY'ers by encouraging the installation of receptacles ground-prong-up
I remember taking a "Basic Electricity" night-school course way back in high school and the instructor pointed out that, if you saw ground-prong-up receptacles, it was a fairly sure bet that it was done by a DIY'er.
Uh-oh... did I start sumthin' I shouldn't have...