I made these from the instructions posted on here. They were fun to make, and the pigs like them alot! They also make for a great thing for my kids to hold them in.
Here is the link with the instructions I have made two sets so far I like to have more then needed because they sometimes stay in them all snuggled up instead of going to their litter pan to pee! grrr
I am pretty sure I found this link on this site but who knows.
http://imageevent.com/bizylizy/craftsguineapigfun/sewingprojects/lilygraceshowtomakeacozy
The instructions were very easy to follow...my first set I made with a flannel outter fabrid and the left over fleece from their cage inside. The second has fleece inside with just a cute pattern regular material and both hold up the same and are used just the same by both pigs.