Picture Wars is a turn-based strategy game where everything is customizable down to the pixel: units, buildings, vehicles, maps, everything. One person posts a picture of the area that the combat will be in, another posts the same picture but with his units added in. On his next turn he just posts the picture again but with his units in different places, and so on. Because of this, basically anything is possible as long as it is fair. This results in several tons of awesome.There are also several variants on this, known as "Modded Matches".The name is also that of a generic forum game, with varying rules, but mainly one-upping the last image.
This website provides examples of:
Arbitrary Gun Power (Averted. Most infantry die from a single hit to the chest or head, and anywhere else will basically make them useless in combat.)
One of the larger explosions was at the end of Part I of Worlds War One, where a hotel receives four huge missiles.
Gamebreaker (Known as imba. The only way to beat imba is to be imba. Though some armies do have uberunits that are hard to get but incredibly destructive.)
Good Colors, Evil Colors (The Colors gamemode obviously, though neither side is really good or evil. Most armies don't have a particular "alignment" so this doesn't apply to them.)
Also true of the now-dead Immortal Empires gamemode. Every side seemed to have their own individual color scheme, with he majority of evil cults gravitating towards saturated colors while the good cults would often be much brighter.
No Recycling (Averted by most. Undead armies even recycle the enemy.)
Not Playing Fair With Resources (In one mode, a single army has to fight against an unlimited force of attackers while trying to sustain it's base. Also, some armies don't have resources, but they usually have some weakness to compensate.)
Nuke 'em: Not uncommon as a sub-trope of Crowning Moment of Awesome.
Poor Communication Kills (Almost every match handwaves why the two armies are building bases in a small area by saying that neither knew the other was there in the first place.)
Rule of Cool (Quite a few of the sub-tropes of Rule of Cool are in Picture Wars.)
Rock Beats Laser: Who would have known that unarmored infantry with laser rifles can be killed by arrows?
Taking You with Me (It is incredibly unlikely that a game will end with anyone left standing.)
Tank Goodness: Virtually every army with access to engines will have some armoured delight lying around.
Obligatory War Crime Scene (Captured units do not generally get away easy. Seen in the match where blunderbuss wielding Skeletons massacre lesser equipped frogs and in another where an OTS officer executes a tied up Anhurian prisoner on his knees.)
Examples from specific armies:
Corrupt Corporate Executive (Trios Enterprises. They eat planets for resources, kill any competitors with their extensive military, and reverse-engineer alien technology for profit.)
They are also attacking a mine held by an enemy empire, to steal their wealth.
Time Police (The as-of-yet seen in action Time Police, who violently deal with time travel and changing the future/past in general. Unless it was destined for the time traveler to change the timeline, in which case they'll let it slide. The Travelers were not destined to do so, and are currently warring with them.)
Time Travel (The Travelers, a race of time traveling aliens from the future who are out there in the past to avert the apocalypse. Given their xenophobia though, it's unlikely they're in it for anyone besides themselves, which in some cases leads to lots of carnage.)
One Nation Under Copyright (Displayed in the OTS, who are the main fighting force of Argent Enterprises, a corporation that runs everything from hospitals to galactic colonization.
Also displayed with Trios Enterprises, which sells everything from fruit to fissile material. Their military is just as extensive as their markets, though somewhat subverted in that Trios Enterprises has nothing that can be called 'civilians'; everything is automated save for the brain-in-a-jar Brainbots.
Honour Before Reason (House Anhur's military, who display suicidal and irrational (fighting with swords against fully armed mercenaries) methods as they fight for their families and empire.)