AHA! FOUND IT. That was quick.
The artist posted it on pixiv.net and it was spread everywhere.
Based on the title I’m assuming it’s based off of an anime called
Ano Hana: The Flower We Saw That Day
[Ano Hi Mita Hana no Namae o Bokutachi wa Mada Shiranai]
And too bad tumblr can only display up to is 1280x1920 cause it looks way better in full size.
Along the way, I found links to some really really awesome anime scenery art, and clouds HERE and HERE, and not to mention some lovely music HERE.
I’m beginning to think that I have a new thing for anime art/scenery haha.