Yup, I've got an indoor cage. Its also made from cubes, its an L shaped 2x4. Couldn't get hold if any cheap correx so I use linoleum. I'm thinking of making a proper pen, you know the ones from wood and chicken wire. That way they can spend some time in my garden.
glitterbug, I sent you an e-mail today about the cubes. I hope you got it? I'm planning on building my piggies new cube cages each as soon as I can. ^^
You make an L shaped cage just like a normal rectangle cage. Have you looked at my pics in the photo galleries? My lino was free, because I just used scraps from the bathroom. It's not expensive at all. Go to you local carpet shop and ask if they have any off cuts