Making a better hide(s) would be easy, but you'll have to get inventive to stick with your current theme.
One easy way to do it is to grab a couple of elongate tupperware containers that are the flexible, almost rubbery, thin type (those more brittle Glad ones are also okay to cut with a pen knife). Cut the hole on the far side of the lid. Cover the whole thing neatly with strips of black electrical tape (wrap the lid and bottom separately so the lid can still be removed). If that doesn't match you theme enough, you can hide the now solid black and nearly light-proof tupperware with rockwork.
Be careful using bleach on your slate. That rock's very porous and will always retain some of the chemical. I rarely use any kind of cleanser past water for my animals, although that'd make some of the "neat freaks" cringe. In the calcium substrate tank, just keep an eye on the feces to make sure they're not coming out with lots of sand in them (a sign of impaction danger).
Your ghost animal, as others told you, is a line-bred hypomelanistic animal (meaning reduced spotting). I don't know how much line-bred work (as opposed to recessive trait work) is done with boas these days, but line-bred traits work based on consistent breeding through the generations - no deviation, as that causes a quick return to the "wild" state.
When you breed your Mack super snow to the hypo, you'll get two results in each offspring. You'll get a partial expression of the Mack co-dominant trait, which won't be super snow, but rather snow (normal eye type, normal body pattern, very faded yellow pigment) in each offspring. The babies can look awesome when they hatch - usually stark black and white; the latter gives way to yellow with age. The hypo characteristic will continue to be expressed to some degree, but most offspring should have an intermediate amount of spotting, somewhere between mom and dad. If you think the hypo is neater than the super snow, then I think the money you paid for it is nothing to worry over, eh? The size of the expo says nothing about the caliber of each vendor there. But, if you're a snake guy, you should be used to dealing with that sort of fellow 
