This is the army that was effectively made with no cost. I went out to the woods and collected a bunch of dry twigs. Based them, washed them with green and added a coat of PVA for protection and extra ugliness.
They are for 'Easy sci-fi' and are grouped as such:
Left corner - Medium 'mechas'
Center - Heavy 'mechas'
Right corner - Artillery
Middle row - four pairs of 'tanks'
front row - infantry teams.
Let's not forget the bright blue dots for advanced effect.
The infantry teams are set up at random, but they usually have three grunts + one of each specialist (anti-infantry, anti-armor and shield).
On a related note, more barky goodness on the finished base of the dreadnought. Used some pigment too.
Fun fact: 'Tree monsters' is actually an elaborate dick joke in Hungarian.