fantastic shots, i wanna be able to take macro shots like that but being a nikon user...
If you get yourself a short macro, say 50mm and a set of extension tubes (again, 50mm of extension) you'll get 2:1 mag (I think).
But yes, it's not x4 mag or close
You can also get macro bellows, but I've not seen them for sale for ages and when I did they were very expensive. Probably cheaper to buy a 450D and the Canon 65mm macro.
159, can you use extension tubes with the Canon 65mm? (sorry, can't remember the model no. of the macro)