I have the tree trunk and the non-knot part of the branches and roots done. Not sewn down yet, though. I used freezer paper, then glued and pressed the edges under.
I did a little test piece, and the paper was hard to get out, so I took the paper out and it's waiting to be top-stitched down. I was going to use invisible thread and a hem-stitch, but now I am going to top-stitch the knots down, so decided I should do the same for the trunk. The space below the branches (next to the trunk) will be blue and the root space will be brown. (the color in the root picture is closer to reality)
I also made these vessels a while ago. I used invisible polyester thread this time instead of cotton thread and I like the look. I blogged about them here but realized I didn't put them up for design wall, and the picture above isn't very exciting so I wanted something more colorful.
Enjoy other people's design wall...check out Judy's blog.