I regularly hunt for event approaches which are unusual and out of the box. I found that Youtube is certainly a good source for these sorts of tips. All you will have to do is check out Youtube and perform a search for "event ideas" and you will see hours and hours worth of video recordings with lots of very good tips. The issue is, who exactly has enough time to watch them all? Thus I am on a continuous mission to put together some notes so as to save me and perhaps other people some time.
Here is a great video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you find a few good ideas for your future party on Youtube!