SAML versus colored Bitcoins in a Zebra-Copy scenario ?

Hi everyone,

I've just started looking into the concept of colored Bitcoins and it
looks pretty interesting. Maybe I'm looking at it wrong, but it seems like
possibly much of what Jun Li and Alan H. Karp describe about using SAML as
authorization mechanism in their 'Zebra Copy' paper, may have an
interesting overlap with what could be expressed with colored Bitcoins.

On admittedly superficial analysis, it would seem that possibly colored
Bitcoins could be used in approximately the same way that the Zebra Copy
paper describes using SAML assertions, but with some added potential
flexibility benefits.

Has anyone considered the use of colored Bitcoins in a Zebra-Copy way?
Would it be a good idea to use colored BitCoins in such a way, or am I
missing something essential and are there practical reasons why colored
BitCoins would be unsuitable for the task.

Rob