several people have! you can request that one of mine be modified or put in a request for a specific character if you don't care whether or not a clip art specific to Valentine's Day is available. If it is an easy DISign or modification to something I already have I can work on it when I get home from work!
here is where my 2009 holiday designs are posted in a thread:
http://www.disboards.com/showthread.php?t=2040267
or you could look in my photobucket for something that could be modified to a Valentine's Day design!