So with 4th of July in USA, I just thought about how cool it would be to have a patriotic teemo skin. Where he uses a Roman Candle as his basic attack that'll leave an explosive dot on enemies with little ticks of explosion as the dot damage effect. Then his particle colors could be red, white and blue. And his Mushrooms explosion can be the popular Mine firework effect. His Q can be the Bottle Rocket firework. His W effect will be that Crackling firework.
I think this would be nice because I noticed some skins have their own country specific theme, like the Winter Games line. So its been done before and should it ever occur to make a USA specific one, I hope its a 4th of July theme and they pick Teemo to be the skin holder :)