Unfortunately, that answers none of my questions. I'm looking for solid ideas of things that can be done, that are interesting to do, and have some form of real

Unfortunately, that answers none of my questions. I'm looking for solid ideas of things that can be done, that are interesting to do, and have some form of real-world (i.e. not just blockchain-contained) interaction, either input or output. What is Ethereum useful for, solidly, that I cannot do today?