I regularly search for event approaches that are unconventional and out of the box. I think that Youtube is undoubtedly a good resource of these kinds of tips. All you will have to do is browse Youtube and perform a search for "birthday party tips" and you can find hours and hours worth of video recordings with lots of awesome advices. The trouble is, who has time to watch them all? Thus I am on a continuous mission to compile some notes in order to save me and perhaps other people some time.
Here is an awesome video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
Hope you find several great tips for your upcoming party on Youtube!