First time I've seen a blocker design for visual confusion, but some existing leg pad designs do incorporate this kind of visual trick to attempt to make the 5-hole look bigger.

Here's a long list of thumbnails of pads: http://www.hockeyworld.com/catHome.ihtml?catID=30&shop=0...

Note that while some just try to look cool, there is a common pattern of diagonal stripes from the inside of the knee to the outside of the foot - when you go down into a butterfly, the idea is that this makes it look like your knees are bent more than they are, and the five-hole is bigger than it is, because the insides of the foot and shin are white like the inside of the crease.

The Vaughan VPG 6* look the most like they're trying to fool the eye. Interestingly, others come close but ruin it by letting a dark pattern repeat right at the inside of the toe.

I thought that this was a Patrick Roy innovation, but couldn't remember where I read about it first.