Ideas for rocks/stones

I want to put down a lawn and in clearing my garden out to make room for it I have shifted about 100 rocks/stones, the smallest being around the size of a housebrick, the largest being around the size of a pillow. I don't want to get rid of them so I am looking for some ideas, perhaps a bit more imaginative than "build a rockery" which is about all I've been able to come up with! Please help!

 

I have seen rock sculptures in various places eg country house gardens, chelsea flower show. The rocks/stones have a hole drilled through the middle and are then strung onto a steel rod for support. Don't know how you would do it yourself though as I would imagine you would need some pretty heavy duty drilling gear?

Cathysue