Rypple 2.3
Dramamine not includedRypple maps your screen onto an animated sine wave.
When I was about fifteen I wrote an After Dark module with the same name. In an episode of nostalgia, I rewrote it for OS X. The original version was created on an 80 MHz first-generation Power Mac, and the performance improvement on modern hardware is obviously rather dramatic!
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Screenshot

Revision History
Changes since 2.2
- Actually works
- Works properly when password is required to turn off screen saver
- Tweaked slider ranges
- Works on multiple monitors
- Added "stretch to fill screen" mode (on by default)
Changes since 2.1
- Added option to choose wave direction: horizontal, vertical, or both
- Increased upper limit of wavelength slider
