Thanks everyone for the replies and theme suggestions!
I think I can modify the functions.php of Tanzaku to do exactly what the Blogger theme does. If you notice, each image post goes from left to right in either a 1x1, 1x2, 2x1, or 2x2 block size. All I'd have to do it first determine how many single squares will fill a horizontal row without using a horizontal scrollbar based on screen width with variable widths but the same throughout after calculating that. Then, one by one left to right, randomly choose which size format to make the post then declare each box space needed for that post, then add the post with a random zoom for the thumbnails then go to the next. The next post will see which square space is available and make another size, checking every square needed before declaring that post space and going to the next.
If I make a WP theme like that, I'll make it free with a backlink or two or something like that

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