I love custom gifts and these little zipper pouches are perfect. I chose to do a Valentine theme one and created an envelop on one side and love verse on the other. I did this using the website picmonkey. They have hearts, postage themes, and all types of fonts. You can even add your own clippings to create collages or edit photos.
Create your images/quotes. Use photos or collages you've created. You will need one being up side down because you will fold this in half. Make sure your images fit into the full page since you will need 1/4 in. seams when sewing.
Use a spray adhesive and spray the back of the paper/cardstock. Place some cotton or any stiff fabric and cut to fit perfectly within the paper. I've shown how to make this on tshirts as well here. I also did a video with my son here.
Print your image.
Add a zipper sewing it right sides together on each side.
Sew side seams up. If you want a strap make sure to add it in as shown in the photo when sewing the seams. Make sure to leave part of the zipper open to pull the right side out.