principles.design is an open source resource created to help you understand and create Design Principles.
There are 80 awesome illustrations and 20 backgrounds in the pack. Every illustration is 100% vector. You can easily scale it to the size you need and use it for prints, in apps, on t-shifts etc. Illustrations are very easy in use, just change colors and shapes as you wish in a few clicks.
Laws of UX is a collection of the maxims and principles that designers can consider when building user interfaces.