The Christmas tree is an easy shape to work with.
For the lace tree:
Choose your lace color. You won’t need very much, but that also depends on how dense you want your lace and how full you want your tree. I only used 2 2inch legths of lace (cut off of my half yard piece). You could also buy the lace that comes on a roll, that has one finished edge, would totally work too. You could choose not to gather the lace in that case.
I started with my longest piece and determined that length based on the size of my canvas.