I was curious to see all of Google's Emoji Kitchen emoji combinations at once, so I put 137,943 of them in a really big grid (using libvips, which handles absurdly large images very well) and then made that deep-zoomable with openseadragon.
This was just for fun; there are more useful Emoji Kitchen websites, including one that open-sources their crawl of all the images, which made this project much easier. Hat tip to Xavier Salazar! https://github.com/xsalazar/emoji-kitchen-backend/