I thought I'd share some templates for creating pixel art tile sets, since that's something I always use when I make tiles. Also, I'll add some general advice when it comes to constructing sets with a ridiculous tile count.If you use a pixel editor such as Pro Motion Pyxel Edit or GrafX2 to create your tiles, you can simply draw over the templates I've made, and all the identical tiles in the map will be updated as you draw.You can also easily erase all instances of unneeded tiles. This can save a lot of time and effort, and allows for a more polished result. Otherwise, I would recommend using only the first three or four tile groups I've listed below.The tiles are 16 by 16 pixels in size and have been drawn with a thick border for readability. This border style is going to add a lot of complexity (mainly sets 5, 8 and 11). In order to limit the tile count, you can try to replace tiles with their closest equivalent. However, this will also increase the amount of transitions between the remaining tiles. Another significant source of complexity is the addition of double slopes (2:1 and 1:2), which will add complexity to a game engine as well.All the tile set templates are licensed under a Creative Commons license.This is a good starting point. I always start with the center tile to make sure it tiles well with itself before it's connected to the other tiles.As you can see, the tiles are color coded to make it easier to gauge the amount of work you can save by flipping the tiles. If you don't want something too repetitive, you can still use the flipped tiles as a starting point for further modifications.By adding these, you can achieve a semi-diagonal impression by using stair step patterns. The resulting set is nice for top-down maps where you want transitions between multiple terrain types without having too many tiles in total.These are nice when you want more details in a smaller space, such as single-tile platforms for a platformer game. This rock tile set from Dinothawr uses only sets 1 and 3, but as seen in this screenshot , it's still possible to achieve structures from set 4, for instance, if you make sure all the transitions work with the existing tiles.Many more combinations are possible now. This is a useful set for walls in a top-down roguelike, for instance. Tiles so far (29)Now we get to attach thinner structures to the base tiles. These are used in this ice tile set . Once you start adding this type of tiles, it'll no longer be possible to use the automapping feature in Tiled due to the complexity of the rules needed.The simplest kind of slopes. These tiles are nice for making your levels look less blocky, although there's not much flexibility with just these four tiles.I don't really find the single-block tiles that useful at this size, but they could be handy for a game where the tiles are larger relative to the resolution.How much complexity you'll add when you introduce these tiles will vary. You can try to use the perpendicular, concave corner tiles found in the previous sets. Otherwise, add diagonal variants as needed. Here's the finished rock tile set from the animated example further up, as an example of a sloped set. Tiles so far (89)Notice how this set consists of four times as many tiles as the simple slope set. This does not bode well.Even though this adds a lot of tiles, the amount of transitions to other tiles is fairly limited. You get some very thin platforms this way, which may not fit if you want a chunkier style.Look at all this stuff!In this case, it'll be more difficult to reuse the corners from previously, so a lot more types are needed. With these tiles added, you can start making tile sets such as this complex rock tile set . I've made sure to reuse tiles as much as possible, so I'm not using nearly that many different tiles. Some of the tile count is from duplicate tiles. In practice, you'll want multiple versions of certain tile types for variation, so that inflates the tile count.Tiles from sets 3 and 4 are used in the corresponding leaf set , but not for the rocks (except for the solitary block). Depending on your style, you can pick and choose between the types of tiles you add. There's no single solution there. All the tiles (197)Note that this is not an exhaustive collection of tiles. You may still find some additional transitions I haven't covered. You can even add triple slopes if you won't mind the resulting tile count.The example tile sets can be found here Tile sheets with various selections of tiles:Let me know if there's anything I can add or anything else I can do to make this more useful.