I decided on the airplane and the locket ones.
String or yarn
I took some thin yarn, cut pieces and taped it to one side of the little cloud hearts and the plane. I did the same thing with the locket and the key.
I then put lots and lots of glue and sandwiched the pieces together very carefully. I used the exacto knife to trim any parts that were over hanging, as well as to cut the hole in the locket.
I wrote cute little sayings like: "Love is in the air", "You're just plane cool" and "You have the key to my heart" for the locket.
It turned out to be a fairly easy project and I loved it for the fact that it cost me nothing!