This Haiku Deck "How To" presentation template was created using the Picaresque theme, image filters on.

More about Haiku Deck themes: http://blog.haikudeck.com/presentation-templates-with-pizzazz/

This is a great place to use Haiku Deck's integrated Creative Commons image search:
http://blog.haikudeck.com/free-photos-for-all-how-haiku-deck-puts-creative-....

Helpful tips for finding powerful images here:
http://blog.haikudeck.com/presentation-inspiration-3-power-tips-for-selecti...

For short quotes, the standard two-line format works perfectly. You can either stretch the quote across the two lines, or use the first line for the quote and the second line for the speech title or the date.

If your quote is a big longer, you can use a multiline slide layout. More about that here: http://blog.haikudeck.com/new-text-and-layout-options/

If your quote is long, you'll either want to use a fairly abstract image for the background (be sure to turn the text background screen on for readability)...

...or a solid-color background, like this.