Slate

Slate is a map packaged default with Blockland after it went retail. As of v21, it is gone.

Layout
Slate was a seemingly endless flat plain with invisible ground set at night, but you can still fall off the edge.

Slate Edits
Slate edits usually involved keeping the same map file as slate, while changing the skybox and/or adding a ground texture (technically just a waterblock directly below the 'ground'). Some slate edits became default maps, such as Slate Storm, Slate Sea, and Skylands.

Plate
Plate was a popular Slate edit, by BAC. It looked like a never-ending grass-color baseplate. When Plate 2 came out, also released by BAC, it was alot better-looking with a nice custom skybox.

Adjustable Plate
Adjustable Plate was a smash hit, quickly becoming the most popular slate map for Blockland. It was like Plate, although it had the ability to change the skybox, lighting, sun angle, ground color, percipitiation, and for a while change the ambient noise (such as rain sounds)