Also, I suggest checking out the NightRadio's other project, PixiVisor. [2] It converts an image (progressive scan) to audio and back again. This lets you, for example, see an image processed by a reverb effect, resonant LPF or whatever. It does things with the Fourier transform that I would have guessed were impossible.
http://www.warmplace.ru/soft/pixilang/
Excellent find!
http://www.ohmpie.com/imageencode/
Then just add some standard chorus+reverb processing, possibly a bit of distortion.
There are other programs that do this kind of thing (Photosounder, MetaSynth), oddly not so much free software.
As a side note, it's kind of odd that the coloring in this gui lays out the light spectrum with the low frequencies in violet and the high frequencies in red.
The Analysis & Resynthesis Sound Spectrograph is the closest thing I can think of: http://arss.sourceforge.net It hasn't been updated in a long time but it's still very useful!
Michael Klingbeil's SPEAR is also open source, but a slightly different beast - focused on manipulation of analysis data as a set of partials - it's still insanely useful: http://www.klingbeil.com/spear/
Chris Penrose's excellent Hyperupic was the first tool of this kind I remember encountering, inspired by Xenakis' UPIC system: http://music.columbia.edu/cmc/MusicAndComputers/chapter5/05_... It died with OS9 to the best of my knowledge.
EDIT: Just to say that Alexander Zolotov's work is blowing me away. I didn't realize he was behind SunVox until now, but the portfolio of his projects in this thread is really inspiring.
https://www.youtube.com/watch?v=-GAJ9e8ifYU
(same creator)
The 80s UI in a 2014 app for a 1950s instrument is also great. Nice and weird. I like it.