Make a companion animal petting zoo where you have lots of great natural enclosures. Then have boards all around with care tips and ideas. Enrichment items and cage style ideas and care leaflets to take home. Alongside a boarding business.
DIY Rat Fleece Hammock or for Other Small Animals. I had rats as pets (and they were great pets) and had them in a ferret cage with a plastic material hammock that you couldn’t wash so this would have been ideal. Tutorial from craft nectar here.