Better than Cages! Free Range is Great
Cages are cages, no matter how good, no matter how big. If you can dedicate a room or two or three, or even part of a large room to your guinea pigs, they will be happier than being in a cage!
Each album is a set of photos of a free range environment. You can also get some additional ideas for floor time from these photos, even if you must use a cage.