Trading cards to be used as postcards

I was playing around on this site and came up with this "trading card" that I have made into a postcard. Now that I've decided to use and have put on the front to leave messages for my kids, my guess is that now I need to get my character sketches up so that folks can leave messages for them.

This is a cool site; you can make trading cards and think of the possible uses for authors - Click here for online trading card site

Here is the front of the one I'm going to use as a postcard to pass out everywhere - the back is still being worked on - but hopefully it will be workable.

I can think of so many uses to promote oneself and one's books - put the cover pic, a blurb about the book in the description part and on the back (you have to do this on your own) put your author info, mini biography, or contact info and where to get the books - pass them out for promotional items for every book you have - I may look into getting it done professionally and use them to send out or pass out for the state series.