Henging is easy. All you need to do is take a minimum of 3 things and form the shape of a henge. If this is not an obvious instruction, check out the other henges to see how it's done!
If you need a little more support, Blu-tack or sticky tape may be used, but extra kudos will be given for henging without sticky assistance.
Also, as your progress in your henging, you might wish to play around with lighting, backgrounds, etc etc. That's entirely up to you.
Now all you need to do is get your thinking cap on and begin henging! What are you waiting for?