My S.O. always asks me to teach her new words-- she thinks I'm smart.  So I came across this glass etched thing defining "Soul Mates."  But we're not really soul mates yet, and I don't want to scare her off.  She does frequently claim that we're kindred spirits, so I went around and found this:
Personalized Gifts - Heart Sculpture Love Letter
And wrote a cute definition of Kindred Spirits on there.  
Title: Kindred Spirits
Letter: 
1. n. a person for whom one feels a 
deep emotional, spiritual and 
physical connection, especially a 
soul mate, lover, confidant, or 
best friend, etc.
2. adj. of or describing a 
connection for whom one feels feels 
a mutual affinity which cannot be 
expressed through words. 
3. See: Randi & Kitto
Ending Sentiment Line 1: Be Mine
Ending Sentiment Line 2: XXX-2009
In one of the definitions I wrote 
see: (her name) and (My nickname) .  I thought it was cute.  
Good luck and let us know what you come up with.