I would paper piece the trees. It is a common pattern.

Looks like a Moda fabric collections. Have you look at their website to see if the pattern is there???

Haven't you heard? Only God can make a tree?

I made this type of tree in another pattern. The bottom block is oblong with small squares sown onto the ends and cut off at an angle. For instance in my pattern the bottom blocks were one green piece that was 2 1/2" x 8 1/2" with the lighter color fabric being 2 1/2" square and one 2 1/2" square sown to each end of the longer green piece at an angle and the remainder cut off.

I made a pot holder with a tree using paper piecing.

Unless you are dead set on having a square in the center, I'd go with a pattern like this one where the two tree tiers are tapered (say that five times fast!)...more like a real tree. You could easily adapt this to just two tiers and any size.

http://quilting.about.com/od/blockof...stmas_tree.htm

I think the top one is a flying geese and the 2nd one is a rectangle with snowballed corners. Actually the top one could be a rectangle too, just bigger

Susan

My first idea was that it was 2 flying geese, but it could also be a square/rectangle with HST's on either side. However it was done, it's a fabulous quilt, love those fabrics.

They aren't squares/rectangles with HSTs on the sides. Look at the chevron print one. Unless the maker is sublime at matching diagonal stripes, there is no seam anywhere in that fabric on either tree tier. There are shadows from the quilting lines, but no seams because the chevrons are uninterrupted side to side.

thanks ghostrider...