Only $10 a year to watch some swirling images:
http://www.mentalfx.com/trippypictures/preview5.htm
From their tour:
To further enjoy your kaleidoscopic explorations you can use an autopilot option, which will choose a random animation every 2 minutes. Just sit back and smoke a fat one.
This is also nice:
EPILEPSY WARNING!
A very small percentage of individuals may experience epileptic seizures when exposed to certain light patterns of flashing lights. Exposure to certain light patterns or backgrounds on a television or computer screen or while playing video or computer games, or certain web pages, may induce an epileptic seizure in these individuals. If you experience dizziness, altered vision, eye or muscle twitches, loss of awareness, disorientation, any involuntary movement or convulsions, IMMEDIATELY discontinue viewing the web pages within Mental FX.
This isn't spam, I just saw the site and thought it was sorta funny.