Eventually--um, when I dropped one on the concrete driveway and chipped it--I figured out they were made of glass. Very thick, dense glass. I had never even heard of glass being used as landscaping rocks! But I did find a few vendors online, calling glass the "new" landscaping medium. The following pics are from The Garden of Glass.
They come in several sizes--from itty-bitty to egg-sized rocks like the ones I found--and in just about every color imaginable. So now I'm intrigued. I want to create two flower beds on either side of the walkway up to the front door and these might add that unique, eye-catching appeal I'm looking for. I like the more natural-looking grass green or amber, but the glass also comes in such colors as cobalt blue, hot pink, and neon orange.
So what do y'all think--way cool or incredibly tacky? Go on, give me your honest opinion!