I regularly search for party ideas that are out of the ordinary and out of the box. I think that Youtube is usually a great resource of such ideas. All you have to do is browse Youtube and do a search for "party ideas" and you will see hours worth of clips with many outstanding ideas. The issue is, who has time to see them all? So I am on a continuous mission to put together some details so as to save me and also hopefully others some time.
Here is an awesome video with some crazy party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you see a few great tips for your next gathering on Youtube!