A lot of TLC went into my N7 day renders this year. The ripping and porting process of it all is it's own beast, but I spent some time adding details to the characters.
I created 3 (technically 4) procedural shaders for all of the characters. Albeit, they were simple, it was something that took up time and something I wanted to get perfect. For Tali and Garrus, I created a mud shader that only applies to their legs to give the look of them trudging through the battlefield. Additionally, I created blood splatter shaders that matched their species. Tali got red, while Garrus got blue. The Shepards only got a mud shader that applied to their entire armor.