For my husbands 55th birthday we had a 50's style surprise party. We decorated the house like a 50's soda shop and kept all the plans simple and fun.
The cake was decorated like a record. I used black food coloring but it didnt get as dark as I would have liked. I now know that to get a dark black you need to mix the black food coloring with chocolate frosting and I would do that next time to make it more like a vinyl record.
I bought 50's style car decorations and they not only decorated the tables and area but the big cut out was used for a photo prop and everyone had picture made in the car for fun.
We also had cut out records for decorations on the tables. We played 50's style songs and people were free to dance or do karaoke to the songs as they liked.
We kept the food simple as well and made hamburgers and fries and potato salad. This was a very fun and easy party to host and with it being a surprise for my husband it worked great.