There is royal icing and then there is glaze. The glaze is shinier. Use the search function to find the glaze recipes. I haven't tried it yet.
Yes the Corn Syrup icing is the way to go. I use the recipe from Karens Cookie website. I have used that recipe heaps of times and it is great.
I've used a glaze before, but it's opaque unless you add white food coloring to it. That's the only draw back I had, that and it doesn't dry rock hard like royal icing does. I used the one by GeminiRJ on here: http://www.cakecentral.com/forum/t/681224/cookie-icing
In place of the white food coloring (that I can only find online) I used that Wilton cookie icing since it is really thin and bright white. It comes in a bottle at the grocery store (kinda looks like a glue bottle you use in school, ha ha).
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