There is a book that absolutely transported me as a child. It was in the late 90’s that I read it (’97-’99). It was a picture book about a boy that enters a deep dark forest and encounters strange creatures in the trees. It was a rather eerie book and left me with a sense of mystery and awe. My friend from a conservative family read it too and he said it was demonic, if that tells you anything hahah! So it definitely had a dark, ominous tone. I don’t recall anything else, except that it had a lot of dark green.
Thanks so much for your help! I have been searching for this book my entire adult life. It would mean the world to me if you found it.