One of my favourite layouts, Version 11 ran from 27th September 2006 to 4th of May 2009. Took a LONG time to get all the image editing perfect and the random attack / episode images to work properly. LOTS of people tell me they prefer this layout over the current one.
Moonkitty.NET Version 6: Day which ran from the 3rd of February 2004 to the 5th of April 2005. Was specially coded to change layout depending on the time of day. This was the daytime layout with an image from the Sailor Moon S movie. Luna and Artemis were also animated which I was very proud of. Definitely my hardest layout to design.