Missing You cards are actually fun to make. Giving a visual representation to separation or absence is relatively easy and lends itself perfectly to CAS cards. After all, white space is absence, emptiness.
Consider something as clean and simple as this:
Poor, lonely little birdie! The line of gray connects the bird and the sentiment and serves the function of giving the birdie a place to roost. It's unified, makes its point visually and with words, and has high impact.
And nary a spot of glitter anywhere on it. Yes, it's going to Operation Write Home. I'm so glad I don't have to send miss you cards to my honey anymore.
stamps: Papertrey Faux Ribbon, Love Birds
paper: PTI white