Here's an envelope that I did for an individual that recently lost her mother to cancer. I thought a gentle sympathy of spring flowers and a message of a "perfect brightness of hope" would be appropriate in her time of sadness.
This is done with gouache, acrylic, prismacolor and bit of pen and ink.
I also recently did another envelope for a friend going through a difficult time, and who needed to be reminded that we are not forgotten in our struggles. Here's the envelope that I sent to him: