well, I would rather use the default sunny day one (if possible) and just edit the textures i need to change so that I don't have to mess around with all the trees, ground and everything else. And this is for a contest, so I can't really use someone elses environment.
The sunny day env is just the same as a blank file.
Use this template to create an env. Just replace the texture url to the one you want to use. Also, if you want the defaults, simply remove the line containing it. (this explains the sunny day env being the same as a blank env file) This also is for v1.3, without an env editor for 1.55, I'm not really sure how to edit the 2nd layer of clouds or the other tree type (for the trees, I'm guessing it's sim.tree4, sim.tree5, etc)