funhouse mirrors

I too am new and I need some help. I am doing a CarnEvil theme this year and I need some ideas on how to make funhouse mirrors. I have been on all kinds of sites and apparently not many people buld their own. I have the mylar and have figured out that it shows the corrugation of cardboard so I am going to use poster board, but I need help with the frame and making it bend where I need it to. Any ideas welcomed. Thanks