Many 'blank canvas venues' don't really have anything other than the seating arrangement and a table to create an aisle and focal point for the bride and groom.
There are many ways of doing this .. including a painted backdrop and hanging decorations ... but one of my favourites is the floral arch.
Here are some of my favourite looks.
If you would like to create something like this for your wedding I would thoroughly recommend getting in contact with a uber-talented florist. My favourites to recommend would be http://www.joannetruby.co.uk/ http://www.laurahingstonflowers.com/ and http://www.jayarcherfloraldesign.com/
www.100layercake.com Berrett Photography