Not made out of buttercream, but here's a how to make pinecones using gum paste.
Color gumpaste brown and roll into a 1 inch oblong ball.
Placing scissors at a 90 degree angle, snip "V" shapes using the very end of your scissor blades. Repeat the process just under the first row, alternating the cuts to create the pinecone seeds. Continue the process until the cone is cut all the way to the end. Using a small spatula or knife, make a vertical indention on the middle of each seed. Set aside to dry. Mix copper luster dust with everclear (vodka) and lightly paint the pinecone. Steam (just a few seconds) to set in color. Attach to cake.
These instructions appeared in "Sharing and Caring" web site. Look them up as pictures were included.
id use tip 103, slightly smaller, and do similar to a rose on a stick method, but use short jumping strokes. dropping down the stick further then you would a rose to elongate the pinecone. sorry that is hard to explain, really need a visual.
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