All ye who work with yarn and with frosting, take a gander at:
http://blog.pinkcakebox.com/surprise-knitting-birthday-cake-2009-02-14.htm Really. :-)
(note: I am generally most impressed with sculpted cakes that actually work both as cakes and as what they're "supposed" to be, rather than which look like they'd be impossible to serve - like the dress form cake on the same site - or largely inedible, so take my impressed-ness with the appropriate grain of salt)