I been think about this for a while and want to share it with you and hear about your thoughs on it.
Back when I got into Warhammer 40k I choose Ultramarines mostly because the Blue color and after reading about them I liked them a lot beign the more white guys in a mostly gray or black universe) in that period I build my models by the book only once did I made a conversion and it only was to make a kneeling marine. but after stating my blog for a strange reason I got to make my orks my primary project, so strong focus on them that you are hard pressed to find Ultramarine post or themes in my blog. since then I have started to do things that where not possible before like DIY projects like my Helikopta or my Deff dread . or building my kits on non standard ways like Krusha or Blazta.
As you can see my SM affected my by never deviating from the codex while my orks did it by open my mind to conversions and the like.
I would bet that armies players get affected in a similar fashion and would like to hear how?