A few weeks ago, my plugin developer (iKeirnez) mentioned the need for Sponge alternative short domain on Reddit to me. I was swamped with projects so I couldn't think ways to help. Right now as I'm less busy, I think there could be something fun that I can offer.
Have you ever heard of .et domain? It's a ccTLD of Ethiopia that's not released to the public yet mainly due to slowness in building infrastructure and massive possibilities of domain hacks. Even though it's not open for public registration, I can help register it for ya if you want something like these for short domains:
Just throwing ideas out there.