Does Kdenlive have a theme chooser like iMovie can.

I don't know iMovie. Can you explain what you mean?

If you think about themes for DVD creation, then no, I do not plan to extend the DVD Wizard because there are too many other things to do on the editing stuff, which is Kdenlive's first goal, and there are other DVD programs...

I mean a theme for the film itself.
You can see it here:

http://www.apple.com/ilife/imovie/

click on get to know iMovie it gives an example of a holywood style theme film.

Is it possible to use Movie themes with kdenlive.

Themes are not available.