I often was wishing I could re-use doorsigns from conventions, but due to change of theme and people who share the room with you that didn't seem so easy. So what I did was make badges that can be combined and exchanged just as you need it. They will hang in a row in front of your door or you also can use them as a badge between conventions :)

Commissions: http://furbase.de/index.php?page=Th.....threadID=67083