How about D-Lid (a la David Rodan with D-Rod)? I find myself calling him D-Lid all the time without actually thinking about it. Catches on. That and 'dildo'.
A tad off topic but me and my friends have a couple more for other players...
Danny "Goose" Meyer - derived from the length of his neck.
Mark "Suitcase" Chaffey - most likely you've heard this before. The way he stands resembles someone holding two suitcases.
Alex "Happy" Gilmour - Happy Gilmour
Wayne "Angry Pills" Campbell - from the intra club match where he played in the "possibles" team. Friends said he was not happy.
Mark "Brownlow" Coughlan -
Mark "Ottens" Graham - resembles the appearance of Brad Ottens from a distance.