I made #66, #67, #68, and #69, i choose to use a square with equal sides because it can be used in diferent media, including, for example, iphone (apps). The tree is the same, except for the roots; i changed them a little for a better fit with the shape, like in the circle.
Also, the graphic can be used in any color, like in entry #69, where i changed to blue.
Again, thannk you so much for your feedback, Hugs!
Sue.