Old pallets or crates are a fine alternative to the traditional coffee table and are incredibly versatile too. The ones here have simply been turned upside down — but you could screw yours together if you tend to move your furniture around a lot. You could also stack them or cut them down to size or use one pallet and elevate it with small apple crates for example. A coat of paint will transform the trusty courier once again.
Coffee tables should be the same height as the surrounding seating with 18 inches being a good average (although it will depend on your furniture). If you select a coffee table with a lip make sure the lip isn’t higher than the adjacent seating or you’ll end up hitting your drink against the lip when you try to set it down. The idea is to put your drink down not up.