They make colored decorative sugar here, including light blue. Do they not have that where you are? It's in all our grocery stores in the baking isles.
It's funny, I was just looking for a way to make colored sugar today! I found a method on the internet. All you do is spread your sugar on some parchment paper, add desired food coloring, one drop at a time, and mix with a spatula. Allow to dry and store in airtight container. Tip: If the sugar turns out too dark, you can just add more white sugar.
Hope this helps!
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