Existing postcard designs:
http://www.behance.net/gallery/Art-Educators-Workshop/6475205
I think that these postcard designs are fairly interesting in terms of the way the designer has used only 2 colours along with stock. The colours have been separated with the orange/pink being on the right hand side and the majority of the black ink being aligned to the left.
http://www.behance.net/gallery/2012-Southeast-Tech-Portfolio-Show-Campaign/4046529
This designer has designed a series of products, one of the products being a postcard, the use of one colour along with a consistent stock portrays the message well and precisely.
I feel that these postcards are successful as they rely purely on colour to outline the content on the card. The use of colour is fairly wide in terms of the different colours that have been used. The overall design is fairly vector based.
http://www.behance.net/gallery/Postcards-Collection/6714589
A more illustrative approach to producing a postcard, the basis of this design could have began through the use of photography by actually capturing the women in this posture and then working from that photograph.
http://www.behance.net/gallery/Oxford-Postcard/6699583
A postcard that uses purely photography, the content of the postcard is giving snapshots of the location Oxford, in Britain, it is portraying the outdoors the greenery and some of Oxfords iconic architecture.
http://www.behance.net/gallery/Postcard-I/5475787
The se of shapes within this series of postcards is fairly interesting, I like the way the designee has taken the content and merged it using the theme of shapes.






































