ReaperAA has released a new custom palette for Heretic. It has been created in about a week that changes/tweaks some of the colors that he didn't like much and felt that they needed an improvement. The main changes are to the blues and greens. And unlike some other palettes, he did not include any new assets. This palette should work with vanilla assets just fine and give you a very interesting new experience when it comes to the old classic gem.