Jack-O-Lantern is a screen saver that displays a carved 3D pumpkin
http://www.killerrobots.com/jack-o-lantern/ Jack-O-Lantern Screen Saver v1.5 (c) 2005-13 Killer Robots
Version 1.5 (For Mac OS X 10.7 and later) Download Now! (17.7 MB)
Version 1.3.3 (For Mac OS X 10.4 to 10.6) Download Now! (2.3 MB) Description: Jack-O-Lantern is a screen saver that displays a carved 3D pumpkin. The pumpkin is recreated in loving detail right down to the flickering candle inside. Several carving designs are included, and you can even create your own to be displayed. No getting your hands dirty carving the real thing. Artificial pumpkin smell not included.
Requirements: - Mac OS X 10.7 or later (for version 1.5)
- OpenGL compatible video card
What's New in v1.5: - Updated pumpkin with higher resolution textures.
- Added 5 new carvings.
- Updated all carvings to increase resolution and fix minor issues.
- Added Retina screen support.
- Added optional ambient horror sounds.
- Added optional lightning strikes.
- Added new light color setting.
- Improved flame graphic.
- Removed main-monitor only option, as it's included with OS X.
http://www.killerrobots.com/jack-o-lantern/