I would've never thought to use river rock at the base of potted plants/at the edges of the patio, but maybe that could work. A larger, flat top rock could even act as a riser for a led candle lantern, etc.
Idea for Our Kitchen Wall - My Favourite Exposed White Brick Wall Inspiration! (Hally's, a California-inspired cafe in London, creates a homey feel with shiplap siding, exposed/painted brick, warm woods and painted furniture.
Almost everyone knows that plants and trees convert carbon dioxide into oxygen. We all need oxygen to breathe and survive. Every plant carries out this conversion. Some of them do this more effectively. NASA is always busy doing something.