A few Game Mode Ideas

Gauntlet: Both sides have a maximum of 20 minutes to win the game. If there are no winners the entire map explodes or Baron/Dragon explode all towers and inhibs still left and explode both nexuses and BOTH teams lose.

More team fights. Interesting Wombo Combos( Looking at you ) Or ) Earlier roaming. Earlier Dragon No Baron More wards ( What is vision? ) Shorter game times

Sightless:

What's a world without Vision? All vision items are disabled due to this or that bug and the tower vision settings have been somehow deleted in the code. TOTAL DARKNESS ACROSS THE MAP.

No roaming? Very cautious team fighting? Always roaming together?

I have Eyes Everywhere:

What's a world with ALL the vision? Sight stone disabled because there is no fog of war and all team mates have all vision of every single thing in the jungle and in bushes in lane. Watch out jungler . You might be getting ganked yourself. Or let's see who really does have map awareness on your team.

I'm watching you. :)