I'd like to find out if there is a link between green eyes and being
of mixed Hispanic/European origin.  I vaguely remember a reference in
the tv show "In Living Color".

Quickly now ... People with green eyes basically have blue and brown
eyes at the same time.  Without getting into the genetics, any
parental mixture which results in offspring getting brown genes from
one parent and blue from another can wind up with "green eyes". 
That's a very simple explanation, without getting into
dominant/recessive genes and alleles and all that.

There was this lovely girl named Laquita Flanigan who lived in Ft
stanton NM. Half Spanish  and half irish with green eyes . The irish
went to Mexico . Mexico being catholic . So there are these green eyed
beauties.
 It was not the first time. Celts built fortress in Spain and they met
before in centuries past .

A hundred million ancestors over the past hundred million years
contributed to the DNA of nearly all of us, so nearly all of us are of
mixed origin. Admittedly the more recent ansestors usually determine
our eye color, but it could have been a pre-human 100 million years
ago.   Neil