Multiple Arena Spleef Map

I've been working on this spleef map for a while now, and it's sort of designed to give players a Bukkit feeling using all Vanilla features. I need only 3 more arenas until all the teleporters in the main lobby are full, but I don't know what other versions of spleef are the most fun.

In order to complete this map, I just need some suggestions on fun varieties of spleef.

Features:

• 9 (12 when completed) different spleef arenas
  
• Main lobby and lobbies for every arena
  
• Lobby Teleporter item to quickly get back to the main lobby
  
• 5 Optional status effects at every arena in any combination (Invisibility, Nausea, Jump Boost, Blindness, and Speed)
  
• Arenas automatically reset using SethBling's setblock structure creator
  
• Winners are announced to everyone on the map
  

Current Spleef Arenas

• Small Standard Spleef (Floor made of Jack O' Lanterns, cleared away with a Efficiency V diamond axe)
  
• Medium Standard Spleef
  
• Large Standard Spleef
  
• Small TNT Bow Spleef (Everyone gets Flame I Infinity I bows, and the floor is made of TNT)
  
• Medium TNT Bow Spleef
  
• Small TNT Arena (Everyone gets loads of TNT, and the floor of the arena instantly ignites it)
  
• Medium TNT Arena
  
• Small Fire Spleef (Everyone gets Flint & Steel, and the floor is made of wool)
  
• Medium Fire Spleef
  

The arenas can hold virtually any number of players, but I recommend 2-6 players for small arenas, 6-10 for medium arenas, and 10-18 players for the large arena.

Additional Notes

I've tested this in multiplayer quite a bit, and I've found and fixed many bugs. However, if you find any bugs I've missed, please put them in the comments and I'll fix them ASAP.