When you install the Aquarium, the Aquarium SCR file itself goes into your Windows/System32 directory, but the Readme file and uninstall info goes into
c:\program files\serenescreen\marine aquarium time\. That's where you drop the PNG files.
Great suggestion about other possibilities with the logo transitions. Course what would be really funny is if a hand came down and ripped the logo crystal out of the coral, a little dust fell off the sides, and then the same hand came down inserting the new logo crystal into the coral. I think Jim would have a stroke though.