Many, many years ago (has it been 23 already!) I made a few ornaments similar to this one.
Featuring pictures of my 3 little ones they immediately became my favorite ornaments of all time. Year after year I put them in prominent locations on the Christmas tree. As the children grew older (they are all adults now) I loved to reminisce of Christmas from so long ago.
Last year I sorted the ornaments and carefully stored the portrait ornaments away where they would be "safe". I had put them in a sealed container with an aluminum bottom. I guess some kind of a chemical reaction, (or perhaps the lack of circulating air?) caused them considerable damage. The pictures are fine, but the crocheted part turned all brown and ugly. I'll have to redo them some time.
The ones I made this year are for pictures of our first grandchild on her very first Christmas. Very special indeed.