I strongly suggest when using Mod Podge or any other decoupage medium to coat the rim of the jar with petroleum jelly or lip balm (I keep a tube of the cheap stuff for this use) to keep the jar lid from sticking when you try to open it. One of those things that takes a couple minutes but makes life so. much. easier.
After the images are dry, I cut and layered them on to Bazzill type cardstock (I think I got it at Hobby Lobby, just know it was from my stash.) I made about 30 notecards for my stash this way, here are a few examples: