A PCB Color Palette where you can see all the possible colors in a 2 layer PCB, useful for reference in creating PCB Art:
I have used KiCad v5.1.6 for designing this Card.
The files inside KiCad look like this
Start creating your design by layers. This video by TwinkleTwinkie gives a good tutorial on how the whole proccess works. Keep in mind how Unexposed Copper, Exposed Copper, SilkScreen and Naked FR4 look like. Try to play with those combinations. He also shows a good overview of the color palette you will have:
I also have a small PCB Business Card project where I use some other tools like Svg2Shenzen that will help you in creating PCB Art.
Once I had everything finished. I prepared my Gerber files in KiCad, packed them inside a rar and ordered them to PCBWAY with standard 0.8mm thickness and everything else with default settings, HASL with lead, FR4 base, several PCB Colors... 10 of them cost me 5$ + 13$ shipping.
In this repository you can find the Gerber files I made in KiCad and sent to PCBWAY.