This DIY paper invitation from Mr. Printables would be a treat to receive in the mail. Fortunately, it's incredibly simple to make and it makes a perfect party invitation that seems a lot more complex to put together than it actually is.
The 'Pop-Up House Party Invitation' template can be downloaded from the Mr. Printables blog and it includes a charming confetti-print which is ideal for birthdays, although this could really be changed to suit any season.
The template also includes two colorful pull tabs, which is what helps the card to take its 3D shape after it is packed flat into an envelope. To add even more surprise to this shape-shifting card, its interior can be loaded with extra confetti to really announce that it's almost time to party.