Anything that brings a more personal touch to communication is a good thing. I found some sweet notecards at vanessa kimball that are both unique and very affordable.
Green Grass Notecards, set of 4 with matching envelopes, $6
Bird Meadow Notecards, set of 4 with matching envelopes, $6
Love Filigree Notecards, set of 4 with matching envelopes, $6
http://vanessakimball.etsy.com
http://vanessakimball.blogspot.com