I'm using ArcGIS 10.2 Trial and found that there is no Color Ramps. Is it a bug or a restriction?
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first make sure that your esri style is enabled.
You can manage the esri installed and your own style files from the style manager.
Go to customize > style manager.
you can drag and drop from any of the esri installed style (just enable it and it will be listed here) into your profile style (see [localdrive]/user/myname/appdata/)