Here's one way to do it.
http://www.cakecentral.com/cake-decorating-ftopic-618156-0.html
Not sure if you're only interested in a large bassinet, but I have done a miniature one as a cake topper that got rave reviews. I just put two cupcakes together and draped fondant over that. Then shaped gumpaste over a ball (covered in saran wrap) from my daughter's toy box! It was extremely easy to do. There is a picture in my photos. Good luck!
Here's another way to do one: http://www.flickr.com/photos/14541447@N06/sets/72157606719250477/
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