Here's a thread with just cushion cuts. Let me see if I can help with some radiant cut rings as well. I just don't think there's a specific thread just for them though so hopefully some radiant owners will be able to assist you!
I wanna play..I have a radiant that I LOVE..see profile picture. Also, look up previous posts by me to see additional photos. However, my ring is camera shy and doesn't look as sparklicious in pics.