Adding Keynote "Themes"

Since I've received my MacBook Pro, I've been using Keynote more often the Powerpoint due to its compatibility with the intel processor (powerpoint gets slow and sometimes crashes).

My problem is that I can't figure out how to make "custom" themes to save, or even use pre-existing themes from power-point.

I'm in the medical field and some of the pre-created templates aren't really appropriate for a professional medical seminar.

So basically:

1. Where can I get, or import, custom Keynote themes?

2. How can I make my own custom Keynote theme and save it for repeated use? i.e. create a jpeg file in photoshop for the background, etc...

My main concern is the importing of themes. I'm usually good at figuring these things out, but it seems that Apple in many programs (like iMovie HD) don't allow custom generation of themes.

Thanks for the help!


EDIT: I just found in the pane above "save theme" so do I just place my image on the background, and then move all text to front and save the theme?

So this saves properly, but when I open a new slide, it does not keep the picture in the background. What am I doing wrong? What steps do I have to take to keep the background throughout all slide templates?