This might be too complex for waht you are looking for but I know there is a way to make ornaments with a dough you cut out w/ cookie cutters and bake, then paint. You could do a bunch of ornaments that way and maybe the kids could paint them?
Paper chain made w/ red and green paper. Cut strips and tape or staple to make a garland and drape around the tree
I can keep thinking...
For your pinecone idea, go to Michaels and look in their ribbon section. You can find ribbon that is narrow enough you could tie a knot around the top of a pinecone, then make a bow or knot at the top for the hanging loop.
“When one door of happiness closes, another opens; but often we look so long at the closed
door that we do not see the one which has been opened for us.”
Helen Keller (1880–1968)