Overview
Similar to Madoka Titus, the meme originated from Futaba Channel's Inner Model board (模型裏板, mokei uraban). While Madoka Titus is a collaboration of Gundam AGE-1 Titus and Madoka, Homura Sparrow is formed using parts from the 1/144 scale Gundam AGE-1 Sparrow and a Homura Akemi figma.
There are also people using parts from a 1/144 scale Gafran model for Homura but that's another matter to discuss...
External Links
Twitpic「Attempted building Homura Sparrow」
Twitpic「It would be really nice to see me arms folded」