For ground textures try user names "wiley4", "smooz".
For trees try user names "jankvis", "railcentre", "robertoconti19". All are available on the DLS.
I think you're being too modest Dave. For my money you can't get better ground textures than Dave's sets. He even has tutorials on his web site explaining how to use them for the best effect.
Jango also has some nice textures that would work for fall.