If you are planning on designing your own Wood Golem, you might take a look at the Wood Element template's abilities from MotP for some inspiration. Their special abilities are:
Spikes (Ex): A wood element creature can release volleys of bark, splinters, or wood shards, up to four such spikes per round, as a standard action. this attack has a range of 120 feet with no range increment. Damage is 1d6+Strength bonus. The wood element creature can launch up to its total HD in spikes per day.
Woodsense (Ex): A wood element creature can automatically sense the location of anything within 60 feet that it is contact with vegetation, even if the wood element creature isn't in contact with the same vegetation.
Also, in addition to the benefits it would gain from being a construct (immune to mind-influencing effects, poisons, disease, and similar effects; not subject to critical hits, subdual damage, ability damage, energy drain, or death from massive damage), you might consider making them plant creatures, too. Plant creatures are immune to polymorphing and also aren't subject to mind-influencing effects.