Gradient Backgrounds

[kleineluka]

Is your feature request related to a problem? Please describe.
Trello has support for predefined gradient backgrounds for boards (unsure about cards but this in relation to boards' backgrounds), making them more unique and stand apart more.

Describe the solution you'd like
In the "Change Background", have a button next to "Add Background Image" called "Use Gradient" that allows for picking 2-3 colour steps and a direction (ex. diagonal right, horizontal left). Then, just use those colours as the background. Similarly, there could also just be a simple "Colour" option for the background for a single colour.

Describe alternatives you've considered
While you could make gradient backgrounds as images and import them, that is both a lot of work and inefficient to customise. I would like to note that this is probably what Trello does and just provides pre-made gradient images for the background since they don't have a consistent pattern and some have art in them (ex. this one with mountains), but while this proposed solution is less fancy-looking than that, it is also more customisable.

Additional context
Random image examples of Trello's gradient backgrounds from a Google search: example 1, example 2 , example 3

[trobonox]

Thank you for this suggestion! This is a good idea and I've thought about it before, but it would require some changes to the way backgrounds are displayed, so I'm unsure how easy this would be to implement.
If anyone wishes to contribute this feature, I'm open to accept it ASAP, otherwise this is not a development priority until I sort out the required steps to publish a new release of Kanri soon.