The picture shown is something I made for school. I could have made the tree better, but I made everything.
Step 1: Make the hill shape
Step 2: Add grass
Step 3: Apply fragment
You will get something like in the picture.
Step 4: Apply multicoloured gradient
Make a layer above the background and behind the grass. Apply a gradient that is like the one shown in the picture.
Step 5: Render cloud layer
Now, change the LAYER opacity to whatever you wish. I did 118. I resulted in the other shown picture.
TUDAH! Now you can add creepypasta stuff to it like I did and it will look totally awesome :)