Making envelopes is a very satisfying and surprisingly quick and easy project. With all the bills through our letter boxes, it would definitely brighten our day to receive a pretty/colourful home-made envelope instead. We have made the ones we photographed today in two different styles - plain card on the outside with a patterned paper insert or patterned on the outside with a plain insert. The latter could do with a plain sticker for the address to keep the post office happy.
The instructions are very basic. There are downloadable patterns on the internet, however we simply opened up an existing envelope and traced the pattern on to our card and paper. We cut the contrasting insert slightly smaller and glued the two together. Fold the sides in and tape three of them together with double sided tape (or glue). Easy!