A lot of them are very useful, but most of them are very specific to certain people only. That's why I rarely share my flows. As I browse for other flows, try theirs and found out I don't need it.
I am starting to learn German. I can modify my other flow to track the time I spent in the app, and remind me if I haven't reach my daily goal. But my friend won't be impressed, as it doesn't served any purpose for them. Even though most of my
Control UI usage are very useful, when I show them, they just "oh" (not catchy enough). I can say 90% of my flows are something like this, only to my purpose.
After thinking for a while, I think i will focus more on the impression regardless of the usage. We only need to get the idea passed, that Automagic can do such things. Of course in daily usage, we will have to modify them to suit to the needs. I have several flows which are good to show off but serve almost no real purpose for daily activities. But the ones those are useful tend to be not good for show off (kinda ironic). I need to summon those flashy ideas back again to tease my friend, something those will make their jaw fall to the floor and wonder : "How can you do that?"
Several of them such as :
1. Shake to unlock or launch camera. This trigger isn't battery friendly. Lifting my wrist (coupled with Mi Band 2) to capture picture.
2. Phone facing down to screen off and facing up for screen on, or maybe speak out something when we shake or face to certain direction.
3. Wave thru the proximity to change music, hold to play/pause (even though can be useful, I never found usage of it)
4. Voice command with customized reply. Google assistant is good, but I want the phone to answer according to my answer. We can ask something like : "Who is the most handsome man in the world?" and Automagic will show our own picture and tell them it is Desmanto.

Sure, our friend know this is just a joke, but they get the idea it can be done.
5. Tilting our phone to certain degree or maybe use magnet to trigger a flow, wait for a random interval and initiate a fake call screen from public figure, president or any famous artist (using video or widget), we "answer" it and play some prerecorded call or speech output, where we would answer as if it is real. (make it so real, but absurd at the same time, so they know it is just a prank)
6. Faking incoming sms (need root), where you can fake replying it (you don't actually reply), and there will new response based on our reply. It is possible by overlaying widget at the send button and execute other flow to craft the fake reply.
7. Faking a cracked screen and recover it just using a swipe.
The more absurd it is, the better. I am adding above into my to do list. I think I will go with the voice command one first, since it is quite interesting to feed our own answer; which will be different if we really ask to google.