Actually there are many ways how to cycle a palette on NES.

You can cycle colors 1,2,3 in every palette (like, 2 goes to 1, 3 to 2, 1 to 3) - this keeps the background color the same and uses the same predefined set of colors. You can cycle all four colors (1 to 0, 2 to 1, 3 to 2, 0 to 3), this will change the background color too, but don't forget that it is shared between all palettes, so only last write to any color 0 will take effects - thus the background will always have one of colors of one of palettes.

You can also cycle colors between palettes, cycle the 4-color sub palettes itself (all colors of palette 1 to palette 0 etc).

You can even cycle color values. Notice that low nibble of a hex code for a color is hue (0-d), and high nibble is brightness (0-3). So you can keep the top nibble while incrementing or decrementing low nibble, and have effect similar to the one that you can see while moving the Hue slider in a graphics editor.

Megasuperuber necrobump but I have a bit of a clarification question about the color cycling.

Im very very new to the whole nes grafx thing but I have a bit of a problem wrapping my head around the pallets. I am using Shiru's nes screen tool which has the "nes pallet" of the 53ish colors and 4 "sub pallets" of the background colors plus 3 each for 15 colors. Could I confirm these AREN'T related to which colors cycle?

In this bit of code

I pick my cycling colors right? So I don't understand where my 4 extra colors are coming from if nametables only have 15 colors? Did I get mixed up here?

Thanks!

very cool.
thanx!

Yeah if any of you are in the UK and want some burnt for you hook me up!

Most excellent! Yet another suitable NROM program! [shameless_pitch] For those who want a hard-copy, I do burn custom EPROMs for people! [/shameless_pitch]

So great!  Will be so useful for us non visual performers to have cool visuals!  Thank you! 

You are my hero

From the readme:

Grab it here:

http://www.no-carrier.com/software.html