@justjennifer: bloomlikeflowers doesn't clearly mention it, but I understand she tried the gallery and removed it because it wasn't working.
@ bloomlikeflowers: The gallery feature has shortcomings, but it's not THAT clunky; and the 0x0 complicaation has to do with the uploader, not the gallery. When you originally uploaded and inserted the images, you must have seen ONE of them (the tree) behave properly. That's because it's the only one in RGB: the rest are Grayscale, and apparently the wp uploader cannot handle them (that's news to me, too).
So you must go to your Media Library, delete those images, edit them in an image editing application to turn them to RGB, then upload them again and insert them as a gallery. If you retain the plain gallery shortcode, they'll turn up as 3-in-a-row thumbnails. If you want them larger, write:
[gallery columns="2" size="medium"]