I noticed that the icons for PDF and Excel when using the Fiori theme default to the white set. You can see this right in the Grid demo here: http://demos.telerik.com/kendo-ui/grid/excel-export
You can also see the same thing when looking at the Styling icons demo here: http://demos.telerik.com/kendo-ui/styling/icons
I'm using the Excel export option pretty much as it is is set up in the online demo, but the white Excel icon makes things look kind of ugly. I can override, just curious if this is this by default or perhaps just a mistake in the Fiori theme css?