Now I understand what you were looking for!
I actually made a bird cage over like this for my DD;s little Budgie, Azure. The cover was quilted, of course, in blues and aquas to match his name, a hole in the top for the carrying handle, the flap on front and back, and some beads and a couple of his molted feathers attached to the front.
What a great idea you are making.
Jan in VA