Based on previous CC0 work and released into the wild in kind (CC0), to serve as a basis for mine and others' work, this is a platformer 47-tile seamless tileset template with an aseprite template file designed to help people whose workflow may be helped by pre-existing layers.

Tiles are in 16x16 formats and are intended to be an example/template for future work, especially in Aesprite, though they may work for a simpler game as they are.

.PNG Files provided:
Simple tiles
Simple tiles with Numbers
Template
Template with Numbers

.AES Layer Descriptions from Top to Bottom:
* Number: maps to the tile using bitmasking.* The one duplicate (thanks especially to caeles and guy for getting it down so far, see attribution below) is marked with an "x".
* Seamless tileset template ii (as attributed below) shrunk to 16x16 and edited for cleanliness
* "Outer Lines": For outlining the 'feature' you're making the tileset for
* "Ground/Floor": For creating the ground/floor
* "Inner Lines": For transitions or for a simpler image, just the inner lines of the thing
* "Color/Texture": For a color or more complex "inner texture"

Anyway I made this tileset so I could make my tiling life faster in the future and I hope it can do the same for you! It says and is geared to platformers but would probably help with more than that.

* (If you're not familiar with the numbers or method used for autotiling here, guy has a great page here that also goes into a bit more on the work done by the giants whose shoulders I'm standing on: http://www.cr31.co.uk/stagecast/wang/blob.html )

Fuller attribution so it doesn't get its formatting destroyed:

Based on previous CC0 work by https://opengameart.org/users/caeles :
https://opengameart.org/content/seamless-tileset-template-ii (specifically, the 8x6 variant)

Which was also based on his own previous work and work from https://opengameart.org/users/guy :

http://opengameart.org/content/seamless-tileset-template and https://opengameart.org/content/wang-%E2%80%98blob%E2%80%99-tileset by https://opengameart.org/users/guy

The template image and the template layer of the Aesprite source file were scaled down directly from template8x6.png as linked on that page and then modified for clean-reading.

The previews found on seamless tileset template ii, from which I took my images and .ase file with values, were in turn based on CC0 work by guy with the following copyright/attribution notice (quoting this part verbatim from caeles at seamless-tileset-template-ii): "Not required, though a link to appropriate cr31 webpage appreciated." (I believe this would be http://www.cr31.co.uk/stagecast/wang/blob.html )