Posting this so my dumb ass doesn't forget later. Always back your stuff up before playing around, just to be safe.

Open ppu viewer in FCEUX, write down the values you see for the palette you wanna change.

Open the hex editor, make sure View is set to "Rom File". Click the Find... option under Edit. Type the last three values of the palette (if for example it's 0F21313A, you search for 21313A) and click Find Next. If search yields no results, trying searching for the middle two values (in this case you'd type in 2131). Had to do this to find the clipboard's palette in Dr Mario.

If palette hacking an FDS game, open game with HxD instead of FCEUX's built in hex editor to make your changes. Found this out while messing around with Galaxian.

You might see more than one instance of the palette, it's cool just play around with them one change at a time and have fun with it.

Color chart! Never use BLACK 0D or else demons (also screen burn)

    10 days later

    A similar method to this but using Mesen's memory viewer to obtain the palette values from CRAM instead can be used for palette hacking SNES games as well, as long as the palettes aren't somehow compressed.

    Bahamut ZERO

    This palette is amazingly useful.

    I thought about adding a "fuck you" mode in famidash where all black backgrounds become $0D xDD

    BTW nice work on Star Fux, you probably could have done more if you used the original source code like we did!