https://backend.deviantart.com/rss.xml?type=deviation&q=boost%3Awhatshot+in%3Amanga%2Fdigital%2Foekaki+sort%3Atime+meta%3Atoday
Copy-paste the above link into IFTTT's RSS service, then set the action to update device wallpaper upon new entry. Presto! Instant auto-changing Oekaki wallpaper.
Built using DeviantArt's Media RSS implementation: https://www.deviantart.com/developers/rss