What should I use?

My boyfriend wrote me the sweetest song when we were seperated this summer and this Christmas id like to show him how much it means to me by getting it engraved onto something for me and him to have but I just don't know what I should use, I was thinking a picture of the two of us but I can't decide... Help!!

you should probably get him a quitar and engrave it there(asuming thats what he played the song on) or write him a song or something or put it on a blanket or just tell him hwo much he means to you and engrave it on a rock and give it to him. I would apprectiate all of that ecxaxept a quitar cause I font play

For me the pic is ok that is to take him back to his past memories.