Valhalla Shimmer and the Behringer RV600 Reverb Machine are your cheapest options for the "shimmer" effect. Other notable pieces of gear that will do "shimmer":
Rack:
Eventide H3000 (don't know if the Eclipse will do it but I suppose it should have the famed "Crystals" algo that started it all)
Pedal:
Line 6 Verbzilla
Eventide Pitchfactor
Eventide Space
Eventide H9
Zoom MS70CDR
Mooer Shimverb
Behringer RV600 Reverb Machine
Strymon BlueSky
Strymon BigSky
Stymon Timeline
Line 6 M series multifx (M5, M13, etc)
Some of the newer Zoom multis should be capable of this as well.
VST:
Valhalla Shimmer
Soundtoys Crystalizer
Native Instruments Psychedelay (included in guitar rig)
or alternatively, any reverse delay or reverse reverb and a pitch shifter, with some creative routing
If I remeber correctly, a shimmer effect is a reverse reverb with an octave or two up pitcshifter in the feedback loop (meaning only the reverse reverb signal undergoes the pitch shifting), but you can also use a reverse delay to achieve a similar, and in my experience somewhat more controlled effect that you may or may not prefer, and add reverb afterwards to make it bloom.
History lesson: The "trick" was first employed by none other than Brian Eno, before the folks behind the H3000 (two thirds of whom are now Soundtoys, the other third being Dave Derr of Empirical Labs who did the analog side of the box
) made a patch to do this.
I remember the Midas Pro6 I had at work on my previous job was capable of some fun shimmer style stuff on it's pitch shifter effect. I know this is besides the point, but if you have the pleasure of working with one live...
Hope I've helped
