I normally hunt for event approaches which are unconventional and out of the box. I found that Youtube is certainly a great source of this type of tips. All you will have to do is head to Youtube and perform a search for "birthday party suggestions" and you will find hours and hours worth of online videos with many great points. The trouble is, who exactly has time to see them all? Thus I am on a regular mission to compile some details to save me and also hopefully others some time.
Here is a great video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you find several great ideas for your next party on Youtube!