If you're talking about something that's already been printed, then yes you could still print on top of it in a different colour. I believe the people who print in multiple colours like to feed a new stock in while the machine is running, there is some method or another to calculate how many mm of filament you will use to a certain height in the model. But if that seems too hard you could also finish printing your cube, then print a different model on top of it as long as you start at the height the last model left off. There is a setting (bottom) in skeinforge for that. You would likely want to manually purge the nozzle, should be fairly easy as long as you don't bump your first print and knock it out of alignment.
If it's an old print that you one day decided you want to print on top of, you could still do it by tracing the outline of the print in PLA (just re-start the print and stop it after the first perimeter), and use some double sided tape to stick your model back down into position. [edit] if there is not enough surface area on the bottom or the tape is too weak you could also dab a bit of glue to make it work, Just sayin, where there is a will there is a way
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Daid 303
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Joris is well known for changing colors during the print. It will require some measuring and experimenting, but it is possible to do this in 1 go.
This is a good example:
http://www.facebook.com/photo.php?fbid= ... =3&theater
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