You may be wondering, but yes, there are secrets in FF7. I currently know of two worth mention.
1) In the golden scaucer, there is a save point at the trolley station. If you go past it to a house in the background, there should be a guy selling gold points for 100 Gill each.
2) When you race chocobo's, press R1 + R2 to regain stamina. This is a VERY usefull code.
Cloud pick's Aerith up from a bed *cough*
Cloud and Red XIII
Tifa
Sephiroth and Aeris
Cloud and Red XIII sit under the moonlight
Cloud and Red XIII jump up to battel some nasties
NOTE: Feel free to link, or download to these, or any other picture at this site. The background is called "frog.jpg"