Should have put this out earlier...
Mr Whiskers came up with a kit entitled Birdcages. The best part is that it comes with back and front parts of the bird cages thereby saving you the need to do any erasing. So cool!
Here's an art journal done using it.
All images are from Birdcages apart from ostrich (SherrieJD: Flora Finery) & child (Hidden Vintage Studios: Debut Freebie)