Rocks can make wonderful decor. Why? The first reason is because they are so easy to find. You can get rocks for free, as Mother nature has lots of them. And they can be decorated in so many different ways. It does not matter the size, using painted stones or pebbles will do it every time.
You can create a tiny gnome garden using rocks. See this example. It has different sized stones, painted as houses and cars. Choose an empty corner somewhere i your garden and make it look fantastic. Plant some smal plants, such as succulents to add up to the look.