[eru]

I remember someone suggesting using deliberately crude and hand-drawn looking UI elements in the demo. That communicates to non-technical users that it's just a prototype.

Something like https://wiredjs.com/ might work, if you are building a web-ui.

[Tyr42]

I did this, but by not fine tuning the CSS until the end. Just use black and white, leave off the border radius, and make it look "unfinished".

[Zaak]

Fabulous idea. I will definitely use this for future early-stage demos.