i squinted (the scientific test for exactness) and i didn't see anything wrong with the doggy blocks.
but if you see something i don't, then "float" the blocks, by separating them with a narrow sashing of the background color. that way, they're not right up against each other and any difference in size or angle is hardly noticeable. since yours are not noticeable in the first place, this would make them less than invisible.
great work. show us what you decide to do. :shock: :shock: