If you are planning a modern rustic wedding, I recommend spend the majority of your energy and budget in finding a conducive venue/space and letting it do most of the heavy lifting, aesthetically. Keep things very minimal and just add small, luxurious details that your guest will interact with on a more personal and intimate level like these personalized napkins. I just took some very simple but nice linen napkins and stitched in the guests’ name in metallic gold thread. It doesn’t take long to do but I think your guests would appreciate the gesture (and I think the time you spend on each guest’s name would be a rewarding exercise, too). Your guests could then take it home with them as a parting favor or I think they would even be lovely stitched together as a quilt…dinner stains and all. :)
You could present the napkins with silverware rolled inside or as a placemat as shown above. Also, you can look for old silver candlesticks like the image on the inspiration board on Etsy, Ebay, and your local Goodwill/flea markets…just make sure to buy ones with more clean lines than frilly to keep the modern edge.