There are lots of ways you can create your own Andy Goldsworthy inspired art:
Rock balancing – get different-sized rocks and pebbles and experiment balancing them on top of each other to create your own rock-balancing sculpture.
Land art – go outside and find natural resources, such as rocks, sticks and mud and create an arch using these materials.
Photography – take photos of things outdoors at different times of the day. Look at how they change. Maybe you could take the same photo later on in the year to see how it has changed.