Personalization is the key word for weddings today, from decor pieces to the cake cutting silverware, you have the options of getting whatever you want engraved, painted, or even carved into your items.
However, before you spend money on getting that personalization, consider what you will be doing with it afterwards, and that may determine not only if you should spend the money on it, but also what the personalization will say. For example, it is super cute to put "Bride" and "Groom" on things like your champagne glasses, or signs to hang on your chairs, but after the wedding, you aren't a bride and groom anymore, so perhaps if you want to then hang those signs in your house, you may want to put "Mrs." & "Mr." instead, or have your first names and the date engraved on the champagne glasses so they can be reused at your next cocktail party.
Same goes for anything that can be thrown out vs. repurposed later. "Smith Wedding #shefinallysaidyes" on your cocktail napkins can really complete things, but if all the napkins don't get used up, you'll probably be taking them home to re-use them and do you want napkins saying "Smith Wedding #shefinallysaidyes" at your next Christmas Party, or would "The Smiths" be a little more multi-use friendly?
You can always try to resell wedding items after the ceremony, but when it comes to personalized items, the group that will want your items gets very narrowed (If your last name begins with Q, how many other brides are going to need an aisle runner with a big Q on it?). Unless you are 100% certain that your personalized items are generic enough to resell, be careful of what words you use for the personalization so they can be a nice reminder of your day that is still useful.