I stopped using a launcher last year to see if I could do everything in Keyboard Maestro, but there's one thing I can't live without…
Rounded corners.
So I started trying to learn the Custom HTML action to make a very basic Fake Alfred that would pass text inputs to a macro
Fake Alfred with Custom HTML v0.1.kmmacros (25.9 KB)
You can also tweak this great macro to do the same
I'll be honest, I'd love to do something like this, but the lag bringing up the HTML Prompt window is bad enough to keep me from doing this.
As a matter of fact, I'd use the HTML prompt a LOT more if it had no lag on initial window creation.
Feel free to post your nice curvy version of the PWL prompt in the thread. Lovely stuff!
Here…! Prompt With List... On Steroids! 💪🏼 - #61 by olifrost
I feel like the lag might have been longer the first time I invoked it, compared to other times. Or I imagined that.
While it's great we can do it ourself, I do think if Keyboard Maestro rolled rounded corners out across the interface (Search By Name, Prompt with List) it could bring in a whole new crowd…! It'd be a game changer.
It'd be more consistent with palettes too…
I lolled at your Barbie lyrics by the way. 
Do you mean with the PWL macro @olifrost linked to above, or in general? In my experience, it's pretty snappy for simple things like that.
In general.
He's correct that after you bring it up once it is quicker, but still nowhere as instantaneous as I need (like alfred).
I tried an HTML prompt a while back as a replacement for pallets and found that several times it lagged almost a second before appearing, and when I'm trying to invoke it, then type some keys, it completely ruins the flow. Timing is everything for me w/keyboard shortcuts.
I would never try to replace Alfred. As you say, it's snappy and full-featured.
However, there are many macros for which the flexibility afforded by the HTML prompt is really helpful.
