Yeah, I think the QR code is a really smart idea, and if it isn't, maybe a stopkillinggames.com URL somewhere is. I wonder if the Stop Killing Games line might not need to be asserted more strongly if you just remove the "peititon" at the top of the clipboard and size up the "Stop Killing Games" text? I think it's implicitly understood by the rest of the context that it's a petition, and that'd let that aspect of the art also communicate the idea.
Edit: the picture is larger than I thought, it's probably fine even if you don't do that. But yeah, I think the black box is a bit noisy.