Pop-up cards are normally cards that, once opened, have a picture coming outward, giving the reader a surprise. Pictures and printed messages in greeting cards come in various styles, from fine art to humorous to profane. Non-specific cards, unrelated to any occasion, might feature a picture (or a pocket to paste in a personal photograph) but no pre-printed message. Paper Pop Cards has a patent for detachable pop-up cards which lets the pop-up be saved as Keepsake.
These are greeting cards for the budget conscious. There are two common formats for reusable cards. Firstly, there are cards with slits in them positioned to hold pages. Secondly, there are notepad style cards where pages stick to the back of the cards. The pages that have been used for reusable cards can be removed after being received and fresh pages can be used to reuse the cards.