PP: OOOHHH! I want to make this too; I'm thinking two inflatable beach balls. Cut the top off of one and fill with concrete mix, then blow the other up inside of that and make sure the concrete sets up ALL around.
If you want to get nice feel every time and leave a lasting impression on your visitors when visit your garden, then you could consider laying a stepping stone and pathway combo in it. Walkways are an integral part of every garden and they are not only fu