Michael and I have been together for many Christmases now, but we've only had two trees so far - and this year is our first "full size" tree. We don't have many ornaments (yet), but I think our first set of ornaments is a great way to begin your personal family ornament collection. We started our collection last year; I gifted an "M" ornament to Michael, an "L" ornament to our dog Lexi and a "K" ornament to myself. This year we added another "M" ornament for Madilyn and a "J" ornament for Jamison (even though he isn't here yet, he's still family and loved dearly!).
I've been buying these monogram ornaments from Target. They are about $5-$7 each. Last year they offered colored rhinestones, which I had purchased the red for Michael and Lexi and a blue one for my brother. This year they aren't offering colored rhinestones, but the clear rhinestones are just as pretty. These are pretty hefty ornaments, so I would advise hanging them on the branch parts of the tree, otherwise they'd weigh down the thinner branches and look droopy.