I went over the choices with my father because they all sounded craptastic to me, so we went with the green space magic. I didn't want to kill EDI and the geth since I adore the geth, control sounded like I was relying too much on a sane Shepard, and synthesis...well it sucked but I was hoping the inherent DNA would be the same just with some synthetic upgrades.
All the endings were still crap, crappier, and craptastic.
edit: I am glad to know I wasn't the only one that spend a good few minutes trying to shoot the God thing. I was hoping it was a massive troll. Still hoping, but it wouldn't be as funny now.
Also the fourth choice should be yellow and a fifth one purple...and a sixth one orange, to represent more colors. Maybe I wouldn't have been as sad if it was yellow space magic everywhere.