11.   What a great idea!

12.   Where else did the great idea come from?

13.   It sounds like a great idea, but how do fit in?

14.   Peter has a lot of great ideas, but he never seems to follow them through.

15.   Everyone thought it was a great idea when we first put it forward.

16.   It is a great idea, but who is going to put up the money?

17.   Buying the house seemed a great idea at the time, but now I can see it was a mistake.

18.   You can disagree about them, and I personally do, but they are great ideas that have made people think.

19.   A great idea, shall we do it again soon?

20.   Then I had my great idea!