If you read the documentation that comes with the WE Unlimited, then you will find that unless you get WE PRO, only the cliff tilesets that come with the set that you picked when you first created the map will come through. The only way that the cliffs will appear normally (besides getting WE PRO, which i don't even know if it exists), is if you start WCIII with the menu that comes with the enhancer, and it starts WCIII with the patch. Otherwise, u can only use the original tilesets...
As for the icons being green, I had a very similar problem, only with icons that i had imported. It's just a suggestion, but check the paths of your icon files, make sure they look like something like this:
ReplaceableTextures\CommandButtons\BTN******.blp
ReplaceableTextures\CommandButtonsDisabled\DISBTN******.blp
hope i helped :?