Need a good plugin / code for showing images in a grid

Want to display thumbs in a grid format in the content area of a page.

Want to be able to select the category(s) that the thumbs are to be pulled from.

Prefer it not be by featured image

Lazy load or random display is preferd.

Ajax grid is a no, because it seems not to work & lacks developer support to get it going.
and
GridFX is a no for same reason.

Thank You!