Crazy ideas are attractive, exciting and fun to explore and develop. Beware of the idea-fetish some people suffer: they keep walking through life with that one (often many times rejected) idea of theirs. Without being able to move on and look further. Art Fry, 3M's inventor of the post-it noted reckoned that one had to generate and go through roughly 3000 ideas before you may discover one game-changing idea like the post-it. If you get stuck, you may try to write down your idea, on a post-it or in a project definition (as you wish). Once the idea is on paper, you clear your mind and there is room for other ideas to come up.
Creativity in business will become more and more important to make a difference. Good news is that you can fairly easy learn how to be creative, if you want to. A lot is in your attitude.
If you want to read more on generating and developping ideas:
http://www.flandersdc.be/view/nl/2705386-Developing+ideas.html
The Dutch version
http://www.flandersdc.be/view/nl/1452443-Ontwikkel+ideeen.html
is more elaborate than the English one, but you need to start somewhere.
I work for Flanders DC, an organisation that promotes business creativity in Flanders (Belgium).