One of the things I notice is that a lot of these aren't generic decorative images, but are unique to a specific website. It'd be nice if this archive identified the point of origin, and linked back to a snapshot (or to neocities.org) so we could see them in their original context.
Would be nice if it uniquified the GIFs.
E.g. type "dog" and get 11 pages and on the first page (may need to reload to avoid "X" broken links) see the same GIF repeated a few times.
Try "hampster".