As for everything in life, not all designs come to a fruitful end. Some are just there to pass time and have fun, others are proactive creations that never filled a purpose, while some other pieces are just small creations for friends and family.
Here is a small collection of such logos.
Below is a logo proposal I proactively created for Goofra, a company located in Geleen, that creates tools using the light spectrum to analyse different materials (mostly food related). My idea was to separate the logo into the 3 colors that create the light spectrum, namely red, blue and green. There is a full, and a mini-logo version.