I recently completed the 2011 Allen & Ginter Ascent of Man insert set which was 26-cards deep and one of the more aesthetically-pleasing and well-done inserts I can remember. It is sadly not the last thing that needs completing from previous iterations of Ginter.
The reptiles card - upper right on the above scan and card number AOM 12 - is my favorite by far. It's just so colorful and jumps out at me every time I look at the set.
The OCD in me thinks Topps could have pretty easily come up with a 27th card to fill up that empty spot on the third and last page. But oh well.