If postcards of bygone days and modern subjects interest you, make sure to see the first Festival of Postcards at Evelyn Yvonne Theriault's blog, A Canadian Family.
The new carnival is for bloggers to share their love of vintage and modern postcards, and some two dozen bloggers (some international) participated in this inaugural edition.
The topic was wheels, and entries showed bicycles, boats, cars and trains, water wheels and oil derricks, spinning wheels and amusement park rides. Cards included old black-and-white, shiny chrome, and subjects went from serious to funny.
Categories ranged from motorized transportation, non-motorized transportation, wheels in the workplace, to grab bag. Some two dozen bloggers participated. See the article link above.
The deadline for the next Postcard Festival is June 20, and the topic is Main Street. Interpret it literally or creatively. The post should contain the front and back of the card, its size and other details.
Another way to participate is an article on the topic of deltiology. Evelyn asks bloggers to share their expertise and passion and answer why you collect cards, how you got started and whether your collection serves a specific purpose.
Sounds like this Postcard Festival may really fly! I'm guessing "wings" will be a future topic.