(Question) How to Modify Sprites in NES Games

[Rewind]

Does anyone know how to change/modify sprites and palettes in NES games? Is there any tools I can use?
I'm not super proficient at hex editing files, but is that what I will have to do?

[343]

Try using tile layer pro to edit the graphics, pallets needs another programs which I'm not aware of.

[KingMike]

Palettes are small enough that you would usually search through hex, I think. (open PPU Viewer in emulator, note palette data, search for matching data in ROM)

[Fox Cunning]

Speaking of tools, my new favourite is YY-CHR (which you can also find here).

However, how to edit sprites (and palettes) may vary depending on the game. Games that use CHR-RAM often have their sprites compressed.
In that case, you will have to know a bit more than just hex editing.

[heavyjo]

You can also use "Tile Layer Pro"