Have you checked out online party supplies? For a relatively small outlay, these products can create a big impact. The Nativity Giant Decoration Kit (above) from http://www.partiesinpackages.com.au/ , http://www.partyproducts.com.au/ or http://www.shindigz.com/ covers a wall 4m long and 2.4m high. Cost: $49 plus postage and handling.
Other smaller decorations are also availabe: 3m of blue and white snowflakes to hang from the ceiling..$16.25, snowflake-print balloons, candy cane shaped helium balloons and much more. How about decorating a wall with their 'Deck the Walls Scene Setters', adding a Christmas Mantle overlay andd erecting an imitation Christmas tree in front laden with decorations and presents- an instant Christmas scene with little effort or expense. Check out their range. We have found their delivery to be prompt, too.