Every good gamer has more projects on their plate than they can ever hope to accomplish. Two of my more grandiose ideas are:
How about some gaming terrain that is not gothic or bombed out. Both qualities are a bit more complicated to achieve over the normal 40K gaming terrain. Link to TMP discussion about the same, including a number of good image links. TMP
Idea number two. GW is coming out with a large battles book. Released with the codex is expected to be the long awaited Bane Blade, and (if rumor is to be believed) war machine scale demon engines. Home brewed demon engines is a great kit idea. Design a big grinning mouth around a huge cannon & your half way to a design that is IP infringement free. On top of that, the organic look is both forgiving to a beginner green stuff sculptor and easy to cast/mold.