More TUIs, and with eye candies too! :)
Since I wrote my own terminal multiplexer that puts terminals on infinite zoomable canvas [0] and I just can't get enough of putting weird stuff like asciiquarium, cmatrix or tty-clock all around (tried peaclock but it's slightly too fiddly for my taste). There are fun projects just to run in TUIs like astroterm or weathr, but I'd say that the space is still open to terminal toys.
The only problem I have with TUIs is that they're boring after a while but something that can be solved with often theme switching.
[0]: https://race-term.com (commercial)