L.C.
The Oriental Trading they-all-look-exactly-the same assembled crafts are the ones that get tossed in my house. The ones we keep the longest either have a magnet on the back, a photo of my kid on it, or their hand prints.
No clue what you have in mind, but we have a cross on our fridge that one of the kids made at church a few years ago during the Easter egg hunt day. It's simply 2 popsicle sticks that were already hot glued together when we got there, then a peel and stick magnet on the back, and then the foam stickers. It was a super simple craft all ages could do. But they also had colored sharpie markers there. They were supposed to use them to put their name on the back, but the older kids used them to decorate the cross, too, so they were all unique.