I decided to make all my tilesets and palettes open-source since I haven't been using any in years and have slowly been giving people access to my stuff anyways. Most of these tilesets aren't hack-insertable, but nothing stops you from just using the palettes to edit an existing ones (or adding some new tiles if you're savvy enough) and having some nifty new palettes for your hack's maps! Note that this isn't possible for all palettes since some have been edited beyond that point.
Please give credit if used.
I think this will also serve to be a good thread to share your own creations so others can benefit from it!
First some that I made specifically for certain hacks;
Purple castle for Dream of Five.
Castle Pherae for Elibean Nights.
I believe I made this for Skitty, but I don't recall ever seeing him use it.
Plains edit for... Dream of Five, and I believe Skitty and Ecut also used it.
I do believe I also made this for Skitty. Snowy Bern/ruins palette.
Another plains edit for Skitty.
Some of my older (and some derpy) palettes;
Fort with floors made of chocolate I guess?
Blue castle with blue water.
Some green castle with terrible looking grass.
Chocolate castle! (or as it's intended to be, a castle in an arid area)
Palettes I made for my ancient and extinct project;
Snowy castle (also used in Dream of Five and Requiem).
Cyan ish castle.
Royal pink/red castle.
Just a fix of one of the existing palettes in FE7.
Now with slightly darker water.
And also with snow! (best used in mild snowy regions).
Slightly more snowy I guess.
Even more snow!
Red rock mountain range.
With murky green water.
And strawberry juice red water.
Rainy/tropical/humid region. Make of it whatever you want.
Slightly different mountains.
Arid region (goes well with the chocolate arid castle tileset).
And its plains equalevent.
And the village edition.
A more edited castle version (which probably smells heavily like olive oil).
A swampy swamp tileset.
Only made this for a map contest entry, but it's just a minor edit of the previous, so yep.
Deeper inside the swampy swamp (or jungly jungle).
A port on the Western Islands (they'd better have one).
Heaven part 1.
Heaven part 2.
And some bonus content;
Aaand I think that's about it. Likely forgot a thing or two, but they probably aren't noteworthy anyways.