Take a source like a small cello section or an e-bowed guitar or something like that.
Add a LONG, cheap-sounding reverb (I'd probably use a Dynacord VRS-23, but a Logic AVerb should do the trick, as well), and almost entirely remove the original signal in the mix balance.
Add a noise gate to the signal chain to get the reverb to cut off before it completely fades out.
If you're after the complete mush muddying up the mix in "To Here Knows When", add a slow vibrato/pitch modulation of some kind (the VRS-23 has a pitch modulation built in that should produce pretty much exactly the desired results).
Record/bounce that whole mess.
Reverse it in the sample editor.
Repeat the whole procedure for a second track.
Make both WAY too loud in the mix, turning it from a cool psycho atmospheric element into an overpowering mud that drenches the entire song.
Presto!
🙂