Thanks for contacting Telerik support. No, you do not have the option to choose which set of icons to be used. Each built-in skin runs with a specific set of icons which is proper for its color scheme.
Now all three set of icons are completed and available. I do not know about the release schedule exactly, but firstly it was decided to have only two set of icons and next after the release some customers asked to make one more - colorized, so it was added too.
If you like to use built-in skin with a set different than its default, you could take the sprite and make a few custom CSS that will use the specific icons.
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