Whatever your graphics needs, Kenney has you covered with free tiles he’s generously made available on OpenGameArt. Platformer, isometric, and even hexagon tiles are available with a variety of subjects from pirates to racing. If you’re building a game in Godot or anything else, Kenney’s tiles are a great place to use. I especially recommend using them in conjunction with the incredible program Tiled to help you place them conveniently. Kenney also has some paid assets on his website, which are definitely worth considering considering just how many quality packs he’s given the open source community.