This could a "Theme Archives Aros", I can't create it because I haven't figured out how to configure this kind of images
Are you saying this is a theme concept ?
I could make that theme style. What color scheme ?
It has a light-dark transition so we must choose colors that look good in those two ranges.
If we use the same "light" colors as the AROS One Colored Themes I just completed then we just need to make the "dark" variant of each primary color. Then we have to draw the curves. I usually make a blue template.
After you draw the first curve to act as a transition piece from light to dark you can produce the other two curves. You can make the other two using 32bit image compositing with various degrees of semi-transparent grey pixels.
So I'll make a template (prototype) that later can be produced in many different colors. That saves effort.
I reproduced the curve in shades of purple because it was easier to see them I shifted the purple to green and I added the artwork to the left of the transition. The bar on top is what I did. I don't like how dark the original was. I'll work with it to come up with something nice to start with.