Someone may have already mentioned this (prolly not), and I apologize for repeating if they did.
I think it's in episode 4, when Konata is at home trying to study, but then get's distracted and decides to read some manga. I may be wrong, but the little figure on her desk reminds me of Akuma from Street Fighter. Well, that's what I thought when I saw this. I'm prolly looking too much into the references this show makes, but with Lucky Star ya never know!