Outside Window Shutters

Just look at something different, unique, and, if possible, not very expensive indeed exterior shutters.

flower boxes
http://farm1.static.flickr.com/13/144465 ...
or different types of components.
http://www.wfbuilderswholesale.com/image ...

Instead of vouchers, you can put flower boxes or awnings. If you do not like the shutter traditional designs, there are models that look surprisingly contemporary fillings vibrate with color.