Space Invaders on a PIC? No problem...

How to turn a PIC18 into a B&W Text & Graphics PAL video processor with a very few and inexpensive hardware, and a minimum of coding effort?

AVGA is TILE-based AVR interrupt driven audio-video driver for a single-chip game console. Or: It's a great board for developing and prototzping AVR video stuff!

Maze in a Box is a portable game in which you tilt a TV to navigate your way around a 3D maze as though you were in it.

The Uzebox(tm) - a retro-minimalist homebrew game console.

A video game system. The hardware was designed and built using three microcontrollers. The software includes low-level firmware, and a custom video game called Alien Slaughter!

The AVRcam is a small, real-time image processing engine capable of tracking colorful objects. The system was specifically designed to provide the everyday-hobbyist with a vision system that can be easily added to their projects (robot, security, monitoring, etc).

An LPC2138 microcontroller generates the VGA signals that drive the monitor as well as the graphics and fonts. The microcontroller also handles a keyboard, a mouse and some storage memory.

Compact & cost effective ready to go 'drop in' embedded graphics engine that will deliver stand-alone functionality to your project from 4D Systems.

Yet another entry for the scope-abilities list -
These projects offer the ability to convert composite or VGA video signals for oscilloscope display. You'll need a scope with Z/intensity input in addition to the X & Y axes in order to pull this one off.