This YouTube video first shows how to use an embossing folder to emboss just an edge of a piece of cardstock.
Next, she shows one method of cutting a semi-circle in the center of a piece of cardstock using a full circle die.
This could easily be made into a semi-circle "window" by using a straight edge to slice out the bottom of the semi-circle.
Or, to create a place card that has a shape extending above the folded edge. To do that, you would just have to fold the cardstock along the line that would create the semi-circle above.
Using the same full circle die on a different piece of cardstock, you could then give the illusion that the circle is separate from and extending from the top of, your folded place card.
I'll have to do some of these in the future and take some pictures.