I just test cut a few of the envelopes to ensure they cut and fold properly before sharing.
I wanted a contrast of colour, so I printed a textured rectangle and cut the one envelope so the design would stand out in the splash of colour.
The envelope is a simple design that can easily be resized. The shared file has them all set to hold a 4.25 x 5.5 card, but the instructions to adjust the sizing can be found in the notes section.
I hope you enjoy these and find a use for them. I would love to hear from you in the comments if you get a chance.