Marion Trading Cards

I've always wanted to design illustrations to don the backs of playing cards...but until we get to that, I did a series of small simple and subtle pieces that I'd like to leave around the city as placement pieces. They are all less than 6 inches in any direction...and if the interest got big enough, eventually I'd hope that they act as trading cards of sorts...things you just kinda grab if you see it, show it to people, leave somewhere else, trade...just a simply, easy, and really unobtrusive way of getting even the slightest art to people...