Example one: T-72 in Syria http://www.armyrecognition.com/images/stories/news/2013/april/T-72_main_battle_tank_of_Syrian_armed_forces_near_Aleppo_640_001.jpg
Features: Sandbags on top of turret to protect optical devices, ad-hoc armor fencing against RPG's, damaged sideskirts and missing reactive armor bricks, discoloured barrel jacket, missing AA MG on turret
Example two: T-72 in Syria http://edge.liveleak.com/80281E/u/u/thumbs/2013/Feb/13/77ea99ed32a8_sf_1.jpg (bad pic quality)
Features: damaged sideskirts and fully missing sideskirt parts, ad-hoc application of reactive armor bricks, tape peeling off main gun barrel, misarranged reactive armor, missing AA MG on turret
Example three: Merkavas in Israel (Model errors reported elsewhere.) http://1.bp.blogspot.com/-FbQaiYlKiN0/UKG8vQWQWLI/AAAAAAAAUTY/E4z1aa2Mcyo/s1600/n+Israeli+tank+in+a+firing+position+in+the+Israeli-controlled+Golan+Heights+overlooking+the+Syrian+village+of+Bariqa%252C+Monday%252C+Nov.+12%252C+2012.+The+Israeli+military+says+Syrian+mobile+artillery+was+hit+after+respondin.jpg
Fighting equipment attached to the back of the tanks next to exit hatch, additional towing equipment mounted on sideskirts, replacement track links mounted to the sides on the rear of the turret, HMG mounted over main gun and cowitnessed with it
Example four: Training Merkava, still a decent example and merkava on the move: http://i.imgur.com/n1WStDx.jpg http://s1.lemde.fr/image/2007/09/03/534x267/950878_3_92b7_un-char-merkava-en-action-dans-la-bande-de.jpg
Tarp drawn over stowage bin on the rear of the turret, additional towing rope wrapped over the front glacis of tank, towing chains attached to rear and front of the vehicle.
Example five: M1 in Iraq http://images3.wikia.nocookie.net/__cb20110526220849/althistory/images/f/f5/M1A1_abrams_tank_5.jpg
Spare track links attached to sides of turret, towing gear, tarps and various personal gear strapped to the side and the top of the turret. Spare ammo containers mounted to top of turret.
Note that the problem does not only apply to the Tanks, but to all combat vehicles ingame. Especially vehicles like the AMV-7 and T-100 look sterile at this moment.