I did lots of decoupage when I was growing up on boards but I never thought of doing it on a jar. You can find step by step directions here.
Plaid also has another tutorial on decoupaging jars here. This example doesn’t include a photograph. You can decoupage all kinds of things including leaves and fabric. Enjoy the examples below. I hope they inspire you.
another decoupage idea from plaidonline.com
Garden Decoupaged Quart Mason Jar Girls In Pink Solar Light by CarlaRaeVintage on Etsy
image from you-dont-have-to-say-you-love-me.blogspot.com
image from Julia Hull Library
image from thecreativeplace.blogspot.com click image for tutorial
image from kristanlynn.com tutorial on decoupaging jar lids
One advantage of decoupage is that copies work great. You don’t need to use the originals. I can image making copies of love letters between my grandparents along with their photos and mixing them together to make a lovely keepsake of them. Maybe tuck a story inside about their courtship and a treat to eat while reading the story.
If this idea inspires you, let me know. I’d love to share your project here too.