Quoting *Mama G*:" I don't think it's weird. I took pics of mine and then threw them out right away. I thought that after ... [snip!] ... that after 5 or 10 mins they turn positive anyway even if they're negative? I can see why you'd use it as a keepsake though."
That's not true. They just say after 10 mins the results are invalid but I've never seen the results change after a long period of time.
I did keep some of mine from previous pregnancies but eventually threw them away. But I do have pictures.