This project is basically a lesson of mapmaking from my teacher and friend, Zennel, creator of ChivalCraft (check it out!) who gently accepted to share his knowledge.
Then my girlfriend and I had random ideas, and with the magic of commandblocks and work, here it is : our first finished project.
Monsters' Trophies is a PvP map where 4 teams (or less, but not just one ... otherwise you're alone ... yeah ...) fight for their opponents' Trophies (heads).
The teams are actually mobs : Slimes, Blazes, CaveSpiders and Endermen.
The map resets itself and includes three kind of gameplay axes : Farm, Fight, and also team strategy.
Your goal is simple, but the way to complete it is not. You have to grab your 3 opponents' heads and return them to your base. To break a head, you'll need to buy at least two things in your shop : The Beheader, the only tool able to break heads, and blocks to bridge to create a way leading to the middle island. But these items are only available by trading resources you have to return from your farming areas ... whose are located at the extrem opposite of your base!

You can see 4 islands made of different blocks linked by bridges : those are teams' Bases. 2 satellites are floating around each one of them: those are the teams' Mine and Arena. The blocks who compose the island symbolize the team it belongs.
The slimeblocks islands belong to slimes, the mushrooms ones belong to cavespiders, etc ...
You will notice that the Mines and Arenas floating around a team's base does not belong to that team, but to the opposite one. That's the first important thing to know : you'll have to cross two opponent's bases and two bridges to access your farming areas. And another time to return them into your base. That's why you will probably need team strategy : your teammates will have to escort you if you're carrying precious resources or even a Monster's Trophie.
To access your shop, simply wait 3 seconds on the diamond block. obviously, you can only access your base's shop.

There's 3 purchasing stand and an upgradable enchanting table.

Slimes :

Endermen :

Blazes :

Cave Spiders :

The two other purchasing area will allow you to get new swords and armors. You can also use the chest to stock precious stuff.
In order to buy all these things, you'll have to access your farming areas and come back to your shop.
To access your mine or arena, just walk in the floating corresponding item. The farming areas are only accessible for the right team, obviously.
When you die, you lose all of your inventory except the stuff you already bought!

To walk this island soil, you'll have to use your bridge blocks to reach these jump pads. Then, just go ahead through the cave, and you'll finally arrive to the Trophies' monument.
In this tower, severals things are useful : The upgraded enchanting table, where you can enchant your stuff and also trade lapis with levels, a bonus chest containing resources to reward the fastest player, and obviously the top of the tower, where you can find the 4 Monster's Head.
You'll have to grab one of them with your Beheader and then jump down with the jump pads on the edge of the island, and finally place your opponent's head on the correct receptacle!
The first team who returned his 3 opponents' heads win.
Ores :
Mobs :
WOW ! That was long to write, and to read I guess.
The best advice I could give you is simply to test the map !
Waiting for feedbacks :)
If you make a video of Monsters' Trophies, just put a link to this page and give us credits :)
The original download for this map is no longer online. We are looking for a copy.