Copper / Graphics Modes

[polyp2000]

I just read this on wikipedia regarding uses for the copper

... The copper can go further than this and change the background colour often enough to make a blocky graphics display without using any bitmap graphics at all.

Has anyone ever seen this done? are there any good examples of this / screenshots / etc

Id love to know more about this.

N...

[Tcheko]

http://pouet.net/prod.php?which=49527 as an example.

[SamuraiCrow]

To add to what Tcheko offered, AGA can do a resolution of 160x200x12bit high-color on NTSC by deactivating the display DMA and letting the Copper have the unused bus cycles.  PAL does 160x256x12bit mode.  The effect is called Copper Chunky on AGA and Copper Plasma on ECS and older.  ECS is limited to 40x200x12-bit mode due to bandwidth limitations.

[psxphill]

Has anyone ever seen this done?

Pretty much every demo released in the early 90's.
 
Some doom like games had this as an option as well. I think it's what this uses http://www.youtube.com/watch?v=XjKFx74bVgo
 
I think it looks crappy for games.