This forum is for resources you have made and are sharing.
If you mean you can't download them anymore, just post in the thread. But be aware if the artist has removed them it may be because they don't want them used anymore, and their wish should be respected.
I'm currently scratching my head on how to design plains. What do I even put in plains? Some trees (but not too many or it turns into a forest)? Grass? A few bushes? That's a bit dull.
I'm looking for tutorials but Google didn't seem to find much (or maybe I have the wrong keywords). I don't know how to map plains and I don't know how to learn.