I find these types of threads really interesting! A coffee table is, to me, a really "grown up" piece of furniture. Felt like my house was more of a home when I got one. My living room is probably too small for one really, at least one the size I have, but I love it and find it immensely useful for storage. I got it for about £20 at a second hand furniture place.
On mine I have 4 plants, a candle, a bowl with bits of wood, pine cones etc that we have picked up on walks, 4 coasters, an (empty) small vase, an (empty) decorative plant pot in the shape of a bum, TV remote, my glasses case, a hairband, decorative cauldron and pen pot. Some of those things should not be there but I probably won't get round to tidying it yet. I feel like it's a bit cluttered, even without the things that shouldn't be there.
Tell me about your coffee table!