Seriously? Okay well same answer as anything else you might want to try and use. Whatever characteristic vibration your shelf has, that is the characteristic it will pass on to whatever component sits on it.
This isn't just brainstorming, this is the result of testing. Which you can do and are strongly encouraged to do yourself. Don't have to build anything either. Just get some of whatever you're thinking of using, cut it up into three or four pieces, and sit your component on it. Might want to start with cheap easy stuff like MDF and different woods- pine, oak, teak, etc.
Before trying under the component try tapping on it. Tap and listen. Sounds goofy but try it. Then try it under your component. Do this enough, you will find out that it does indeed impart this character into the music. Try soft stuff like sorbothane. Tennis balls. Inner tubes. Whatever. Does not matter. Just try it. After a while you will not even need to try, you will just know based on your experience.
So that's the serious answer. Even though the whole thing still sounds like a joke to me, even without the flame thrower and the mold.