Narrative Machinima
Screen-based narratives made using pre-existing, often modded, computer games. Many of these explore innovative conceptual territory.
Examples:
Red vs Blue
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Sequential Machinima
With the use of certain Photoshop filters, comics fonts, and fonts for speech bubbles, in-game screenshots can also be used to quickly create graphic novels.
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Abstract Machinima
Screen-based visual abstractions made using pre-existing, often modded, computer games.
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Expanded Machinima
Non-narrative cinematic works produced within a game-based production environment. The term is play on Expanded Cinema, coined by Gene Youngblood in his 1970 book of the same name.
Examples:
The Pellucid World
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Sonichima
Sound works produced within a game-based production environment. See also chiptune.
Examples:
Tree Wave
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Generative Art Mods
Exploit the real time capabilities of game technologies to produce ever-renewing art works.
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Performative Interventions
Disrupt in-game norms to expose underlying functions of game play.
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Site-specific Installations and site-relative mods
Compare similarities and differences between real and virtual worlds, drawing us further into a realit of fantasy.
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Real time performance instruments
Allow audio and visual artists to create stunning, live performances in a range of virtual entertainment environments.

Like games, artistic game mods may be single player or multiplayer. Multiplayer works make use of networked environments to develop new models of interactivity and collaborative production.

http://en.wikipedia.org/wiki/Artistic_computer_game_modification