Alright, I've done a bit to it. I've added shaders on some monsters(Mostly ones found in the beginning floors), Potions, Scrolls, Mirrors, Gems, and I've also given Naiads some hair dye, so their hair is now a shade of blue.
I shouldn't really call this a work, it's just a small collection of minor alterations, but I'll release the first version anyway.
Right click this link and Save As
I'd recommend backing up your default Tileset before doing so, like renaming it defaultTiles2 like I did.