Gardener Garen (Could do with someone who can actually draw)
I am a terrible artist and as such wouldn't even attempt to draw any skin, but maybe if this sparks any grand ideas in someone it could hit off...
I've always thought that a garden (or green finger) garen skin could be quite a laugh, replace his armour with a shirt with rolled up sleeves and a brown leather apron, swap the sword for a spade. Have the spin as a hose spraying water and just have him uncontrollably happy to be growing things on the rift, his W as rotating petals around him.
Note, I've just seen that there have been a couple of posts years ago about this but nothing seemed to come of it. I hadn't seen these before but have put the links in as credit for coming up with the idea first.