This is namida's work, I take no credit for creating the original VGA spec. I've just made this into a usable tileset based on the original VGA imagesPresenting the Rick Astley custom tileset, originally a couple of VGA specs created for the Lemmings Plus games by namida and made into an actual tileset by Flopsy
This tileset is what I used to make the following SEB Lems level.
Revolution 12 - Rick-afinity (from SEB Lems) created by Flopsy and Lucia
Everything you see in this level is in the tileset pretty much including the bricks which aren't in the picture.
I hope you go forth and Rickroll more people in your level packs!
Note: There are no objects in this tileset, just terrain pieces, you'll have to use objects from other tilesets using tileset mixing.