It's feasible. It may take some time to develop, but C# and the .net environment, like most programming environments, have many objects including images, buttons with images, etc. Those object can have code triggered by events, just like the standard checkbox, textbox, dropdown list, etc. Point is, there are ways.
However, I agree that it's important to first focus on developing a functioning / working model and then add the "bells and whistles".
Also, being an open source project, there could theoretically be forks that could provide different "skins", should anyone want to take it that far...
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