See my blog on gifts
It can be done by writing a special note according to the situation in your own handwriting or you can give an extra touch to card by adding some design. Free printable anniversary cards are available in different sizes and may not fit into envelops you have. There are two ways from here, either to make your own envelops or find customized printable envelops from the internet. One another solution is "plain envelop anniversary cards" which can be easily fit in plain envelops. You can find all kinds of stuff on the internet; there are quality free printable anniversary cards, and also normal free printable anniversary cards .