Mushroom Index: Mushroom Color Atlas
An atlas of mushrooms based around their colour.
I don't know that I'll ever have a use for this, but the fact that it exists makes me happy.
Penumbra - colour scheme
Penumbra is a mathematically balanced colour scheme constructed in a perceptually uniform colour space with base colours inspired by the shades of colour occurring in nature due to the light of the sun and the sky. It cleanly separates the perceptual properties of colours while optimally utilizing the available colour space of typical displays.
Visual design rules you can safely follow every time
Visual design rules you can safely follow every time.
You do not have to follow these rules every time. If you have a good reason to break any of them, do. But they are safe to follow every time.
Hexcodle | The Daily Hexcode Guessing Game!
While it's fairly trivial to beat in a number of different ways, it's a fun idea.