Make mail fun again! When you open the mailbox and spot a brightly colored envelope amongst all the boring bills, it’s an instant pick me up! ... Our Envelope Collection features square flap invitation envelopes in an array of vibrant, trendy colors. If you are looking for envelopes for handmade cards, you are in the right place. Choose from packs of 10 or 25 of a single color, or opt for variety packs so you always have the right color on hand. We’ve added envelopes for handmade cards to our lineup as just one more way to make sure you have everything you need for your paper crafting adventures.