I saw these nifty Do-It-Yourself floor cushions on a website. It reminded me of the fluffy pillow beds that I make for my dogs. Mine require no sewing at all. But they might cost a bit more. See the video below.
The dogs and I are also fans of memory foam mattress toppers.
I used a doubled one to make a thick dog bed. See the video below
And I cut one in half to make a comfy crate liner. See the video below