I recently joined the forums because someone on the Nexus told me about that site. The way he described it to me getting to know this forums mods must feel like being an eastern German after the fall of the wall
My favourite SP game series are S.T.A.L.K.E.R., Mass Effect and Fallout which I all modded at some point to a certain extent.
I personally never created mods for any games. The only thing I managed to do were NCCS companions, functioning merge patchs and a mod that made the companions hide their weapons.
That's all I can say so far.