Elias here with Shopify Support. Thank you for this inquiry.
Alternatively, there are third-party apps that can add color swatches to your store without having to get into too much coding. I’ve handpicked a couple for you and they also offer a free trial for you to try out.
If you require assistance with these apps, you can always reach out to the developers directly through the contact information found in the Support section of the app’s page.
Let me know if these options help! If you have any further questions regarding this topic, feel free to reply to this thread and I’d be happy to help.
I think the suggested help articles are definitely useful and if you are not comfortable with some coding an app might be the best choice.
Adding color swatches to a theme can be different from theme to theme depending on how the variant switch is implemented.
A few weeks ago I created a tutorial where I demonstrate this for the Debut Theme, while I try to explain the variant switch in depth.
If anyone in the future prefers video content, you may find this useful:
Have a good day :-)