Sure, I got a few ideas for you.
One idea is to mix your pines! Cut different kinds of branches from other pine trees! You can sort of mix the different kinds of trees together and just slide the braches in like you would fake flowers. If you don't mind using faux spray snow - you can spray the cut branches with snow. It will make it look like snow is naturally scattered through the tree, especially by spreading out the branches all over the tree.
Fruits might work too - don't know how long they would last. But pears, limes, apples etc would look very natural. You can also frost them lightly with white glitter as if they are "frozen" or "snowed on."
Red berry branches - if you find any!
Bunch together 6 cinnamon sticks, wrap it with red ribbon and tie a red bow.
You can also buy real poinsettias (red and white), cut them off and scatter them around the tree.
Roses would look beautiful too. Any kind of flower really, experiment with colors together.
Twigs or bare branches would look gorgeous too, weird small twisted twigs, either natural or add fine glitter to them.
Also strange leaves if you can find them. Like a whole branch or half a branch. You can glitter the branch very easily.
Nuts would also work like chestnuts etc.
I would also start collecting natural things now and dry them out too.
Check out my thread here: http://mymerrychristmas.com/forum/sh...ad.php?t=19796
The first post has links to all kinds of gorgeous photos you can get inspired by. Some of the things you can recreate naturally at home with a little creativity.