Wow, and I'm just hemming squares of cotton.
I'm making a couple dozen and just playing with the fancy stitches on my machine and practicing a rolled hem (something I've never really been able to do).
These are just for everyday use around the house, nothing fancy -- just fun.
could you use a decorative scissor and just trim the edge or could you stitch 1/2 inch in from the edge around all 4 sides and then ravel the edges? use your serger and do a rolled edge on the napkins. Embroidering the bride and grooms monogram on them might take a bit to much time but would be a nice touch. How fancy/upscale do you want them to be. What is the theme of the shower???