A collection of your photos (the giver and receiver), photos of mutual experiences that you had, photos that reflect the two of you. The photos are arranged in a frame and some sort of inscription would be a lovely addition. Collect photos of the two of you from all sorts of situations, cut them up and arrange them according to the size of your frame. You can also frame the collage with a nice frame and write the inscription on the frame or the collage with a colored magic marker.
My story: “I collected photos of myself and my boyfriend from various trips, experiences, single photos, ones with funny faces, etc. I cut the photos, arranged them, put them in a frame and on the frame I wrote a line from a song that we love: “Of all the lovers I could dream of, I only asked for you.”