Cheap and easy DIY toys for small pets. Just use the toilet paper and paper towel rolls you're already throwing out to make affordable toys for chinchillas, rabbits, guinea pigs, rats, and other small pets.
Maze Haven (upside view). Great for buns (ferrets and rats too). Available from: http://www.busybunny.com/catalog/gimme-shelter.htm or in Australia: http://bunnyworld.com.au/prod27.htm
Member Gallery: C cages/homemade cages - Page 4 - The Guinea Pig Forum
Make toys for your kids from sticks and toilet paper rolls. Perfect for Julia.
Simple, Cheap Guinea Pig Run
Adorable and cheap guinea pig cage. Small children pool, animal fence from pet smart, and you can fill in the rest :) My baby girls would adore this if we had the room.
Choosing to build a C&C cage means the sky's the limit to all different types of customizations. This is a 2x4 C&C cage that my piggies Wilson and Apollo currently share.
The Blasphemous Homemaker: Guinea Pig Cage Enhancements
guinea pig cage: (I'd make it an IKEA hack w/2 6'L bookcases sideways on top w/shelves underneath for food & supplies.)
Member Gallery: C cages/homemade cages - Page 11 - The Guinea Pig Forum