There are a lot of interesting Reverb pedals that feature ethereal sounds.
$179.00 USD free shipping incl. from Shift-Line
Shift Line are a Russian company that also make other reverbs ...the focus is on the unusual. They started life doing preamps which personally I found were both pedestrian and drab.
I said 'unusual' and this is definitely different.
It works like this ...you can hit a power chord or a few notes ...perhaps maybe an arpeggiated chord and it will play that short phrase to infinity along with a dramatic wash of reverb.
It will then accompany you as you play over it.
You can 'tap' in a cord change then carry on. Yes Yes...it is a kind of phrase loop pedal.
The simplicity and the price make it attractive.