A simple 3D form concept where different faces act as different parts of the form. The default state looks like a flat button which surprises the user by rotating to show the next face which is the text input.
On submission the user sees a pulsating loader and finally the thankyou message on completion. This thankyou message face could also be used to show validation errors.
This concept can be further enhanced to have multiple inputs as different faces of the cuboids being manipulated dynamically using JS.