It looks like analog video synthesis is starting to see the surge in experimentation that the Internet has brought to audio synthesis.
This is a preview of a Sergio Martinez’s DIY FPGA-based video synthesizer. Martinez connected the FPGA to an old computer monitor, and then recorded the images with a cheap webcam. The coloured dots are [...]

Between 1971 and 1973, Dan Sandin designed and built the Sandin Image Processor (IP) a patch programmable analog computer for real-time manipulation of video inputs.
In other words - a modular synth for video.
The whole video is great - Sandin is a great communicator and the video reminds me about some of the great things of [...]

OT: I’ve been getting more and more interested recently with developments in the area of generating video from or effected by audio.
The VGA Expropriator, an interesting DIY analog video synthesizer, caught my eye:
This “VGA Expropriator” will be the first in a series of proprietary analogue hardware devices which seek to explore the possibilities of digital/analogue hybrid [...]

Edirol has announced the CG-8 Visual Synthesizer. Just as synthesis in music prompted new waves of musical creativity so the CG-8 is set to do the same for the visual artist.
In a musical context, a sampling synthesizer takes audio in or regenerates it from a wave generator and then modulates it with filters and amplifiers [...]