So I used to have a strymon big Sky and loved the heck out of that thing. The one thing I used all the time was the cloud and bloom reverb machines and I miss them so much. I've been trying to figure out how the heck to get That sound and the other day I think I landed on it.
I put a cavern and a particle verb in parallel. BOOM! The cave verb gives me that big wide open attack, blended with the particle for that later blooming ethereal sound and I was right where I wanted to be! I'd love to see line 6 develop some more of those types of whacky reverb likenin the big Sky, but for now, I'm pretty happy with this configuration.
Hopefully this helps someone out!