I am subscribed to a youtuber and for his 200th video he made a custom tower defense map. I think this would be really neat in our server and we can have something called clan wars. People don't have to bring anything with them as supplies are given to them and they can have betting and stuff. Here is the link to the video where he explains everything http://www.youtube.com/watch?v=w_subCq2IMw&list=PL2E35EBCF273E6B8D&index=1&feature=plcp. I think this would just be a very cool event please consider it. ALso here is the download link : http://www.planetminecraft.com/project/sethblings-minecraft-tower-control/

btw the youtuber's name is sethbling.