I think that's real nice, I suppose as long as the pine cones have opened, otherwise you will be having little tree's to pull out. I could see drying some and doing that in the fall, It would make for a very lovely arrangement.
Two things we always used pine cones for- 1. we roll in peanut butter and seed and put it out for the birds when the weather is to harsh for them to find enough to eat. It keeps the song birds and birds like the blue jays and cardinals in the area 2- I have some that are Xmas decorations, very simple sprayed with some varnish and a bit of glitter on the ends. The sentimental part in me loves it because I always think of my son making them as a child. I like the cinnamon infused ones that you can get at the stores.