Best DIY iPhone Docks

Cassette Case Dock

I'm a big believer in this specific DIY dock, and all it takes is a cassette tape case. You can use a big or small case (it doesn't really matter), but opening it up all the way so that it's somewhat backwards makes for a great iPhone dock that props up your iPhone at the perfect viewing angle.

Furthermore, you can use the case to hold your earbuds while you're traveling, and you can also cut a groove in the case so that your iPhone doesn't slip out (as demonstrated in the video linked).