One of the largest contributors to the Cinema 4D community is NitroMan. Through Nitro4D there are plenty of great free and premium tools for Cinema 4D that have accumulated over the years.
Recently, NitroMan offers a holiday gift in a new plugin (for the season of course), called MagicXtree. As you can probably guess, MagixXtree will allow you to build highly detailed conifer style trees in C4D – perfect for the holiday season, or if you need to populate some hero trees in your scene.
The MagicXtree plugin is a free download over at Nitro4D. Check out MagicXtree for C4D here. MagicXtree is for both Windows and Mac 32 and 64 bit systems and runs under Cinema 4D R12 through to R16, broadcast and studio versions.