I was looking at some cakes in the gallery and I come across this cake:
http://www.cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1250208

How would I go about making trees like that or are they just plastic?

Sorry for the double post, I accidentally hit submit before I finished.

Those look like plastic. I've made evergreen trees twice and I really like how they turned out. Here is the link for the tutorial that I followed.

All I did different was add brown fondant for a trunk and put both the tree top and trunk on a skewer so that I could stick it into the cake.

Here are pics of the two cakes I did with trees.

It looks like the trees in the picture you showed are plastic?

Here is a you tube video by Aine 2

If either of those responses had anything to do with making a cone out of GP/fondant and cutting snips all around to get the effect, I recommend that as well! I put sanding sugar on the tips to imitate snow too. If ya want snow.

That's awesome and so simple! Thank you both.