Forget about what other people have made and think about what you would like to make from it. Think about what areas you can remove which won't stop it working. Think about what you can build onto the outside. Consider what materials are available to you, what bits of junk you have laying around that you could use. Consider your skills and what you are good at, your other interest etc. Look at all the shapes you see around you and think about what might just work. Once you have done all that make YOUR puzzle and be proud that you have created something new and entirely on your own.