I recently added a small hourglass to one of my mini "altars." I bought this game and ended up just pulling out the cards in it to use as an Oracle deck so I almost put the hourglass that came with it into the donation pile. But then, as I was walking past a bookcase, I spotted an empty spot and it just seems to fit there, among the random assortment of items.
I occasionally walk up and turn the hourglass over to just watch the sand fall, pondering the passage of time.
"Sand thru the hourglass... so are the days of our lives."
"To see a world in a grain of sand,
And a heaven in a wild flower,
Hold infinity in the palm of your hand,
And eternity in an hour." - William Blake