I really liked the way Genie used a chipboard stand from the back of a photo frame - it makes a great (and quirky!) birdhouse. I recommed a visit to her blog - and make sure you read the 'Crafters Commandments' whilst you're there!
Sue's version is such fun, I love her use of different materials (are those clothespeg trees?) Go visit her blog and see some close-ups.
Finally Maureen's birdhouse.....absolutely charming ..... and another example of a great use of materials.