Dragon and Baron New Summoner's Rift suggestions.
I have observed this phenomena happen often. Many times when the enemy team has a huge lead and are pushed to all three inhib towers near late game, their enemy jungler can usually solo dragon / baron. This doesn't give the team which is behind enough time to contest it. Since the laners are busy pushed up, or harassing the contesting team. I think it would be more fair, if a team wanted to get baron or dragon they would need all five or four of their players to get it at all stages of the game. Thus giving time for the enemy to push up lanes/ take their own jungle creeps/ contest for the dragon/baron to hopefully make a comeback (give them more opportunities). A fed jungler can easily take the third, fourth and fifth dragon solo. If you're full build, you can do baron solo.
My point is that what if every time you kill the dragon / baron it comes back evolved? For instance, the first dragon you kill, it dies. Then a different coloured dragon can come back. Like fighting stages of dragons and the fifth dragon, for the buff, can be this insane huge monster dragon that deals tons of damage and requires the whole team's cooperation. After all, the fifth buff which lasts for 3 minutes is pretty op.
This would make the game more interesting because each buff would be given by a different dragon.