I regularly look for party ideas that are unusual and out of the box. I found that Youtube is generally a good resource for these tips. All you will have to do is visit Youtube and perform a search for "birthday party ideas" and you can find hours and hours worth of videos clips with various wonderful ideas. The issue is, who has the amount of time to watch them all? Thus I am on a regular mission to collect some notes to save me and also hopefully other people some time.
Here is a great video with some insane party ideas - https://www.youtube.com/watch?v=wUlJSgYGmFw
I hope you see several great tips for your future event on Youtube!