I do quite like the "all seasons" tree . This was my first initial thought for a logo (just not a painted style like this) but I'm pretty sure it's been done more than once so it'd need some work to make it original.
How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in your life you will have been all of these. - George Washington Carver