Greyish? The stuff in the tupperware? It's sphagnum moss, must have caught the light funny.
Thank you Pure! Unfortunately when I was breaking the pots a couple of stray pieces flew into the air every now and then.. I ended up getting one small piece in my mouth and chomping down on it later.. yuck.
Nah it was actually very easy to set up, breaking the pots was the worst part, I still have to clean up the stray fragments from the cement sidewalk outside..
Those bromiliads are going to want a fair amount of light as well as more drainage like brock said. Looks good. Some Pothos would be nice in there too.