Are you as excited as I am for the Fourth of July? Seriously, fireworks and we should be able to see them from our house. Awesome! I started thinking about invitations, so I put together this printable version.
If you have Photoshop, you can download the .psd file, add your information and add a second to a page.
And, you can use standard envelopes from any office supply store, no searching for a specific size.