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Thanks everyone who helped!

Actually I am interested exactly in pushing the limits.

Is the same situation with the attribute table values? Only 3 32x32 attribute block can be changed?

If I don't use sprites or/and scrolling does it help anyhow to increase number of changed colors or attribute block values?

Thanks a lot guys! I hoped maybe it was possible to sacrifice side tiles to extend hblank possibilites. The fact that it's needed to sacrifice entire scanline is sad. Everything becomes quite impractical. So as tepples said (and I have understood it right) it's needed one scanline to change 3 values...

By "several blank lines" you mean blank scan lines? Right?

Concerning the title screen of Indiana Jones: I see empty tiles in the left not right. Isn't?

What advantages does your device have (over Krikzz's one)?

Is it possible to change the palette's values per a scanline in a practical way (so it can be used in a game and not only demo)?

I guess I am able to produce such a mapper.
The only problem video hardware limitations.

I would like to have FMV injections in my games.
They just impressed me too much in the childhood (:

It seems it's standard possibilities. Isn't it?
I cannot see the 8x1 "colorness".

Thanks for the demos! Impressive!

But from the technical point of view 3 colors + background is real for each 8x1 pixel block using fullscreen and 60 fps (if such a mapper will appear some day)?

Yes I am aware of HSL. I just simplified the question because usually random pixel arrays named as RGB. Actually as far I know NES's HSL values quite closely resembles 2-bit per channel RGB. Yes I read about those restrictions. That's why I am trying to ask some experienced NESers who did something ...

Cool! If it's true. For me "(224x192) x 128 colors x 30 fps" is already acceptable. It would be perfect to reach one-tile-wide borders instead two-tile-wide of 224 but it's ok. It's very good! Thanks for the hope! 93143 cool "hcolor"! what "fps" does it have? Is that re...

What is the most effective way to display almost random RGB(222) array on NES? What result can NES produce to display for example and "RGB222" array of almost arbitary values? I am not (yet) from NES/SNES world so I ask such unintelligent questions! However I will improve. I know that NES ...

I meant arbitary colors but not "absolutely" arbitary. Arbitary for human eye. If you cannot distinguish - then it's fine for me.
I need it not from theoretical view but practical usage.

My only purpose is to display random RGB array having for example about 100 colors and with 30 FPS. As far I see currently I can do it for 256x144 view. I don't know anything about SNES programming I just started to read tutorial/manuals. For example my current development for Sega MD/G can produce ...

Thanks a lot for the first actual numbers! Is this "256x144x8bpp at 30 fps" using the forced vblank? Yes I meant 3/2 buffering. Nevermind! The interlaced graphics is not an option. Too much flickering. Isn't possible somehow using two layers to enhance scaled image made of 2x2 pixel blocks...