Probably no news to a lot of you, but when I first started out designing, this image that some incredible design saviour made helped me massively! Coherence and unification in colour were things that I struggled with (especially being slightly colourblind!) but this hack saved a lot of my... less good designs.
A short looping explore for a client a long time ago, made to get them on board with an approach! Dark backgrounds, bright gradients, and a constant flow of energy helped to sell the idea and the video.