I don't know if there is interest in this or not but I've uploaded 3 heightmaps in esp form.

Mountains, Rivers and Highlands for now.

They are 4x4 quad size.

If anyone is interested I can:

upload the raw files for people to look at or edit
resize the raws to create different sized worlds
upload more types of landscapes.

Note:

Heightmaps are for creating new world spaces.
These are just heightmaps in esp form. They have default texture and no LOD.

I've only uploaded them I wasn't going to use them and didn't like the idea of them going to waste.

Use them however you like, edit them etc. Just don't forget to credit me.