I've been thinking about having my wedding set dipped in rhodium. All of my other jewelry is white gold. DH got me the wedding set when I was 18 and in the past 12 years, my tastes have changed and matured a bit and yellow gold just isn't my thing anymore (nor is the style of my ring, but that's neither here nor there).
My jeweler said it would be $75 for my engagement ring & wedding band and I'd need it redone about once a year. We don't have that kind of money in our budget currently for something so superficial, but if it looks like we'll never have the money to replace my wedding set (keep the diamonds, change the setting), then I'd probably go with this option.