So, I discovered these green smokes in Hyjal Summit while just jumping around trying to find my way out of instanced hyajl, didn't know they were so old and I hav'nt seen them before, but this was another way of getting to them than VoTuS and WizardTrokair posted. Video also includes the small waterfall there with the blue wall + swimming fish in the air.
As i'm saying in 1:44 into the video I will try to find my way up to that towerWill be a challenge!