Dye-virgin seeks advice

I've been reading a lot lately about at-home shine-enhancing treatments,
and I wonder what they would do to undyed hair. My hair is a light brown
color (even darker underneath) with natural highlights which range from
caramel to light, bright gold. What would a "glaze" like, oh say, John
Frieda Luminous Color Glazes (only $10 a pop at CVS) do to my sweet
virgin strands? Also, I've been advised to use a shade which matches the
color of my lightest highlights - a shade which would undoubtedly be
drastically different from the rest of my hair.
As a student, a professional dye job is not only out of my budget but out
of my stratosphere. As for home dye jobs, I can hardly motivate myself to
phone my parents once a week, let alone maintain an unnatural hair
color. I would, however, like a little...boost, if you will: something to give
me a glimmer, but not a change so drastic that I will have to reassure my
roommate that, yes, this is me and I am not some ridiculous blonde who
accdentally bumbled into our room. So I just wanted to know what a
"shine-enhancing treatment" would do for me. Thanks for your help, and
sorry for the lengthy explanation, just wanted to make my situation clear.