Where would I find a place to change, userlink icon Options

[SuperShineyGirl]

I want to change it from the default

to something else like a square of different colored squares like at this journal here

[*Libertie*]

Well, this is the override for S1:

span.ljuser{
background-image: url(http://yourimagehost.com/yourimage.gif);
background-repeat: no-repeat;
background-position: left middle;
}
span.ljuser img{
visibility: hidden;
}

You'd replace the red part with the URL for the image you want to use.

If you hadn't seen this tutorial yet, here's another one:
http://babytest.livejournal.com/9634.html

However, if you're using a free S1 account this won't show up on your comment pages.