I am re-doing my garden to prepare for the fall and winter...?

I want these pebbles that I keep calling fire stones but no one seems to know what I am talking about. I want the red and black stones that kind of look like marble.... to use instead of mulch, I looked into the rubber mulch already and I don't like the way it looks... I want the pebble things.... Sorry my fiance and I just bought our first house so I am kind of new at this... what would be the technical name? PLEASE HELP!!!