My husband does this too. He has all these ideas in his head, he knows what it will look like, but he can never describe it to me. I gave him graph paper and told him to give that a whirl. He has his own fabric stash too, but so far I've had no luck getting him to learn to use a machine (he can hand sew) to make them himself. He knows I have a ton of projects and work to do on my own, so he's in no rush. I agree with having him write down his ideas and such to file away for later.