Loco Roco interview at Siliconera.

"Before we talked about where LocoRoco was going, I asked Tsutomu Kouno, the developer of LocoRoco, about where he got the idea for the game. He laughed, then pulled a white PDA out of his bag and showed me his electronic sketches. On the screen there were blobs squished together, drawn with his touch pen. I was glancing at the early concept art for LocoRoco. And as he flipped through the pages I saw more elements of the game as he explained to me that he was working on the idea for LocoRoco on the train."

Full Source: Siliconera