When I set my boundary lines, I tend to fill up the space completely. However, a few of these doodles break that pattern and leave a lot of white space, such as #19 or #22.
This card is standard ACEO size: 2.5 x 3.5. It is an original and is signed on the back.
My ACEOs -- doodles, collages, and paintings -- are now available through eBay: http://shop.ebay.com/lifeneedsart/m.html