seen here. The first set contained Kristin and Joe (as minifigs) on bicycles. The next set contained a LEGO versions of their favorite things. The third set (pictured here) was a LEGO version of the exact picnic they were having (at the time) with Joe proposing to Kristin... at that point (I assume) Joe pulled out a (temporary) LEGO engagement ring in a LEGO ring box.
I must say, best LEGO engagement idea, evar!
Congratulations you two and may you two have many years together, filled happiness and MOC building!