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.
Another consideration is how it will sit on your floor or rug and if it will damage those surfaces. Splintered table legs or rusty metal bases can scratch or stain the flooring. Secondhand stores sometimes leave those areas unrefinished so be sure to check. Sculptural wood coffee tables tell their own story and can add a natural element and warmth to a room with multiple upholstered pieces. Sealers and of course coasters can help protect the surface from water damage.