This pattern of a tree is taken directly from a metal sculpture that a church has and asked me to make a stained glass pattern from. This particular version is simplifed from the original, as it was full of detail. It can be found HERE.  They wanted a rectangular pattern but i could not resist adapting it for a round panel.  --Round panels are some "complete" and "independent"  ha ha... my total preference to rectangular panels hanging free in rectangular windows.  Built in... thats another story.