The scene from Da Capo is exactly what I'm looking for, except I suppose my only issue is I want it to span a good 9 seconds. I'll mess around with it though as well as the Sakurasou opening, which I'm actually editing with for this amv, derp.
I looked through Aoi no Bungaku 5 but didn't see anything over a solid background, will check out 6 later if nothing else comes up. And yeah, don't really want to mask out individual petals or scour a whole new series for a scene, but no worries! Thanks for all yall's suggestions so far.