Comparing picture quality online.
A very simple placeholder image generator with zero dependencies. Returns a data URI (or raw SVG source) as a string for use in templates.
Presents portfolio as randomly placed rounded thumbnails that expands to full width and height on hover.
Thumbnail hover effect with CSS3.
Various grid style galleries that use CSS animations & transitions to morph thumb-sized blocks into full-size images.
A responsive image gallery using only CSS with a centered button on the hover and centered and cropped thumbnails.
Recreation of Spotify artist radio thumbnails.
In combination with data attributes, you can build a thumbnail image with title and description using just one single line of HTML code.
Angled Thumbnail Hover Interaction.
Responsive flexbox unordered list grid of YouTube video thumbnails with Fancybox links.
Thumbnail CSS hover transition.
CSS Thumbnail responsive flexbox hover transition.
CSS flexbox thumbnail arrangements.
This should work with older browsers as far as IE9. Older browsers and non-supporting browsers will get a "conservative" design instead.