OK, here's my mini mod, improving campaign map textures, trees, and sea. Save-game compatible, textures can work on any map (almost maybe..) though they're desighned for vanilla and it's clones on the technical level.

Installation is simple:
if you have unpacked files make backup copy (simply rename to anything) terrain folder and 2 txt-files:
descr_aerial_map_ground_types.txt
descr_climates.txt

Then extract rar content to the main folder (this is not modfolder and should go into main data)
To uninstall, delete or rename/replace again new files and swap them with originals;
if you havent unpacked anything just extract data folder into M2's main folder to install, to uninstall delete terrain folder and 2 txt's.

Screenies :




DL link (17megs)