The Gift of Time. I absolutely adore this idea. I wish I had known about this the very first year that I was married as I would have used it as a wedding gift (although it would make a fabulous birthday, anniversary or Christmas gift now)!
This is an incredibly sweet idea. "Open when you need to know how much I love you; open when you don't feel beautiful; open when you need a laugh; open when you miss me; open when you're mad at me; open when you need a date night, etc.