To that person you want to express your gratitude to
Carnation card
<toumei> acrylic card

Sending fresh flowers for Mother's Day is nice, but a postcard is surely a more casual option. This pixelated carnation sits in the center of a clear acrylic panel. The modern graphic flower can be carved out by hand and then placed in a vase for display. It can be mailed as a non-standard-size postcard with a 180 yen stamp, making it easy to send to a distant address.