Long exposure night photography can be a fun pass-time especially on a cool summer evening.
"Light painting" can make things even more fun. If you've looked into light painting you've no doubt seen Orb's, spherical mystery lights....Orb photos are created by spinning bright LED lights.
This Instructable will show you an easy way to make a low cost orb creator and give basic instructions on how you can create your own mysterious Orb Photos
You don't need an expensive camera to take shots like these. Just one that can keep the lens open for 30 seconds or so.
A good option is an inexpensive Canon brand point and shoot and free CHDK (Canon Hack Development Kit) software see http://chdk.wikia.com/wiki/CHDK . See the website for models supported.
Here is a flickr pool that shows more examples of Light Painting Orbs