[New Game Mode Concept] Dream Realm
Based on lore written by me here and here.
#Dream Realm
Map: recolored summoner rift Type: 4v4 and 6v6 versions Restriction: each players must have at least 20 playable champions
Version 1
During champion picking time each team leader picks 15 champions for other team to choose from. Then team picks like usual out of available champions. Game starts with each player having 500 gold, however as time goes on they do not get passive (items granting gold still work, but gives platinum coins) gold gain. Killing minions grant platinum coins instead of gold. Players visiting base can tribute their collected platinum coins into base. Every 5 minutes all platinum coins collected into base are transformed into gold and distributed evenly between all champions. In addition, each player can sacrifice 300 platinum coins to cause this conversion and distribution happen early. Instead of normal jungle monsters there would be new creatures.
Red buff replaced with Green Ghosts buff: It grants bonus vision, increase movement speed and gives bonus platinum coins from jungle monsters.
Blue buff replaced with White Ghosts buff: It restores mana and health as you do damage, reduces damage taken from jungle monsters and cause you become invisible while stationary for several sec.
Dragon is replaced with Golden Stag: Killing it grants whole team limited buffs which heals them based on their damage. In addition, killing it will increase power of jungle monsters (it stacks).
Baron is replaced by King of Ghosts: If it is not killed after 10 min of being spawned it will start to roam map ant attack any champions encountered. Killing it will cause all jungle monsters to be executed and rewards from it will be distributed evenly to killer team (also, all team members will be affected by Green Ghosts and White Ghosts buffs even if camps are already cleared).
In this map wards lasts 50% shorter and vision wards gets automatically destroyed after 2 min of being placed. River turtle jungle monster will not spawn.
Version 2
Each team leader ban 3 champs. Then each players picks 2 champs to play as. When everyone have picked two champions they are allowed to choose 1 of those two., but are not allowed to swap champions with each other.
Game starts with each player having 0 gold, but with 8 (or 12 in 6v6 mode) treasure chests around the map (random locations). Player who opens any of chest gains 200 gold. These chests respawn after 7,5 min after being picked up into another random location and have 100% more gold than before.
After 20 mins players who haven't picked any treasure box gains 300 bonus gold and a buff:
Noble Sacrifice: reduce cooldown of 
by 50% for 1 min.
Dragon is replaced with Golden Stag: Killing it will grant your team members 150 gold, but strengthens all jungle monsters in the map (it stacks). In addition, all jungle camps on your side of the map will be revealed to your team for 1min 45 sec.
Baron is replaced by King Of Ghost: When he spawns he will stay in his den for 5 min. After that he will start to roam the map attacking champions. When he is killed while roaming he will instantly respawn inside of his den. When killed in his den he will grant usual rewards.
Version 3
Banning and picking like in the draft. No normal jungle monsters except two: Golden Stag instead of the dragon and King of Ghosts instead of baron. Now jungle is full with nightmarish beings who roams jungle, are aggressive and attack champions on sight. They are much stronger than normal jungle monsters and require two champions to jungle (or no jungler at all).
Killing Golden Stag will temporally strengthen jungle monster, but will also cause them to run away from your team mates (if your team killed Golden Stag).
Killing King of Ghosts will automatically kill all jungle monsters giving all exp and gold from them to your team (distributed evenly). In addition, your next 3 minions waves will have 50% more minions.