DIY coaster feet for speakers and components

I have been making speaker/component feet and I thought I share. I use marble floor samples (size 2"x2"). They look really nice. I even made a DIY guide if anybody is interested. I don't know if they really improve the sound, but they protect my hardwood floor, look nice, and give a nice sturdy stand for my speakers and components including some vibration dampening due to the thin rubber pads. What do you think?

Supplies needed:
8 2x2" Marble samples
Gasket Rubber sheets (or alternative flat rubber mat) 1/16" thickness and at least one 6x6" sheet
Crazy Glue (or alternative that will bond rubber to stone)
Ruler, Pen, Scissors

Comments and suggestions always welcome!

DIY guide with lots of pictures