Here is an idea that would make league so much more fun.

We all know the 4 maps of league of legends by heart. Every brush, camp, wooden critter, and fallen stone. What if all of the sudden the landscape was changed organically by the players. What if there were a form of barricades. An item(s) Riot can put in the shop that to semi-permanently create an impassable wall about the same size as 's but one that does not go away after a time duration. Instead make them like pink wards and have them stay till destroyed by being hit a certain number of times. Now automatically you may thing that this item would make a rather large number of ults useless. I thought of that, what if the barricades took like 3 or even 4 seconds to set up. You could even make different kinds, ones that could set up in one second but only take 2 hits and then others that take 4 seconds but take like seven hits. Now I know the other big problem play placed terrain would cause. The fear that you could block up your minion waves or camps with them. Well that one is simple, you make the walls have minion and monster sized holes. Heck just have them faze through them with some cool looking particle effects. It's not like league is short on suspension of disbelief. If you combine barricades with wards all of the sudden an infinite array of strategic options open to you. If you have the four though you can set wall up to cover flank locations, funnel the enemy team or even create a "safe" (No such thing in league) bunker type aria for your ADC to shoot from. Once again if you planned it in advance. I'm just saying it's a simple mechanic that would change the game and open a up to a new style of game play. Where league is now everything is very fast paced and spontaneous, introducing this one idea could give those more tactically minded players a very good fighting chance to shine. You would still have the classic league chaos of the one mistake team fight turnaround, but you could orchestrate those mistakes. Now a flank teleport could be stopped due to an unexpected wall. Wards could now be prioritized to watch open approaches instead of just every approach. You could also turn the other teams walls ageist them by backing them up to them.

On a finishing note there would obviously be some places that walls could not go, namely spawn, and under turrets. But even with those restrictions the game would open up and gain a new life. It would take way the fixed patterns of so many players who just do the same thing over and over and make them half to think on the fly or far ahead.