I like those cubes! Maybe I should make one for Poggles... it's a great idea!
I like the rounded bases of the hedgie bags from clairepartlow too. I wonder how she makes it so that the interior doesn't pull out? Is there an inside seam? Or does that top seam just hold it all in? I wonder...
I guess if you didn't want the interior to pull out, you could also just put a few stitches into the bottom to hold it into place.
Poggles likes digging in his bag too, but the outcome is that he is able to bunch up the interior around him to make a little nest, kind of like building a wall. I like that, and I think he does too. Whenever his "nest" gets too close to the doorway, I just push it back in so that he can do it again.
Thanks for all the links!