Yes it's been done before but it doesn't make it any less cute and nerdy to me. My now fiancé proposed to me on the front cannon turret of the historic WWII Liberty Steam Ship the SS Jeremiah O'Brien with this, I squeed!
Check out these wedding bands by Sakurako Shimizu. They are molded into a waveform representation of your partner's voice recorded saying "I do," or any phrase you choose. A very cool and unorthodox idea!
This is the professional photo taken of my custom designed engagement ring! It was designed after the Zora's Sapphire from Legend of Zelda: Ocarina of Time! My fiancé and I are huge Zelda fans, and of course, our wedding planning is already Zelda-theme centered! He proposed to me on May 29, 2011 while we were on vacation!