Those are actually really profound.
There's so much time "captured" in those stones and glass. Their endured existence transfers well as representation of life. It's really captivating.

I think with a complete backdrop (eliminate blank canvas) and filled with clear resin to seal it for eternity these would sell well at a craft market and even online.

There's something mystical about representing ourselves (human and environment) in miniature form. It's like a "god perspective" like those broken pot mini fairy gardens that have become really popular.