Flowers!
So, I've been sitting here for the past hour thinking about this.
Flowers, flowers are something that is normally a plant with beautiful petals right? We have zyra, who is roses but.. She's more thorns than roses.
I want to suggest a beautiful champion, or skin concepts, in which flowers and their petals are the main focus.
For a champion you could have it be someone like udyr, but whose q activates a differant type of petal to maybe enhance auto attacks? Q is a Lily, Champion's next auto attack gains 2%-4%-6%-8%-10% Armor pen. W is a Snapdragon, Champion's next auto attack snares the enemy briefly (snare is ..1-.5s at each level) E is a Rose, Champion's next auto attack increases damage towards the target briefly for 5s at all ranks. R is Angel's Trumpet, For 5-10-15s the next auto attack used by the champion cause a "hallucination" effect on targets, which lasts for 3s, causing enemy and ally champions to transform into differant targets. Hp bars go invisible along with mana bars. (Say this champion uses her r then auto attacks the enemies soraka- while hollucinating soraka's Adc will turn into her tank, while her tank turns into her adc. They will not switch positions - but soraka will not beable to see hp or mana bars over top of their heads (The little icons above the minimap could be left normal.) So if soraka panics while hallucinating, She could heal the wrong person on her team. Vice versa of the champion auto attacks the enemies ADC - the enemies get switch around. therefore the support that she was attacking could turn into the tank or the adc.)
It would be interesting, and you could literally make the champion a flower if you wanted, a floating gigantic flower whose voice is something similar to the sound of wind. The petals just change with each skill selection.
Now for skins, well obviously we would have to include zyra into this Give her sunflowers that spit seeds and we'll say GGWP.
We could also include Maokai make his saplings little flower pots that run around and explode into shattered clay and stuff.
After all, just a broad suggestion.
skin... it basically makes every ability pink petal based