So, this is my next try. I deliberately used different textures though I like these I used in my first try also a lot.
This has now sea, grass, dirt, hills, foothills and mountains.
I like how the grass texture looks after i put a slight bump on it - a lot of vegatation with not much effort.
And for the foothills and mountains I generated bump maps with RobA's methods, put a texture on them for colouring and bumped this texture also - I think the combination of these bump maps looks quite natural.