2007 Cover A
99¢ Only Stores used to litter their aisles with these thinnish coloring books for (what else) a buck. They measure roughly 7 ¾" x 11 ¾" at a centimeter and a half thick, running about 80 pages each. I found four different covers myself, but there were only two variations in contents and back covers. There's a fifth cover online, but it didn't feature J'Onn J'Onzz, so let it burn.
2007 Cover B
In fact, J'Onn didn't appear on the frontpiece of either 2007 edition, which emphasized Superman alongside Batman, Wonder Woman and the Flash. The back cover is a group shot that's turned up on various other bits of merchandising.
2007 Back Cover
The 2008 editions wised up and emphasized Batman, with the full team stuck like Colorforms in the background.A smooshed version of the same images wound up on the new back covers.
2008 Cover A
I assume two sets of material were laid out for the pair of 2007 editions, which actually featured 2006 copyrights on most pages, then new front and back covers were slapped on those same books with a uniform 2008 copyright.
2008 Cover B
Most of the space inside is devoted to pin-ups and activities employing stock art, but each has unique stories and origin sequences as well.
2008 Back Cover