This is a picture of the cover of a copy of "Poems and Stories" (includes Adventures of Tom B., Farmer Giles of Ham, Leaf by Niggle, and others). It might be my imagination, but in the roots of the tree (on the right hand side) you can find J.R.R.T's initials. I don't know who drew the picture, ight be JRRT himself. Weird, isn't it?
PS: Sorry for the smudged image. Blame it on the camera.