Yes, that is what they are for...scrapbooking or paper crafts. I don't scrap book, but I do make cards. I use them on my cards all the time. Just add a little glue or double sided tape.
I haven't tried paper crafts . i do have a friend that loves scrapbooking and get stuff for her. I look at other peoples auctions for handmade cards, which are beautiful and stock up so I have to add to with winning auctions.
I have some handmade cards listed. I used some of my paper butterflies on one of them. Also, on some mini cards I just listed. A lot of people who win the butterflies from me use them for scrapbooking.