I follow Sarah Renae Clark on YouTube, and I have wanted for a long time to get her color charts, but I don’t have a color printer, and I don’t have a iPad or tablet like that to use them.
So, imagine how thrilled I was when she made a paper version!
The boxes themselves are gorgeous:

Each one has a sticker so you can label them to tell them apart.
The inside:

And:

The cards themselves are two sided with a photo showing the use of the color scheme on one side and a breakdown of the colors on the other.
The colors go all the way to the side of the card so you can compare them to swatches you have.
Three cards for example:

The same three cards flipped:

The back also shows different saturation options for the colors.
I LOVE these cards because I am THE WORST at picking color schemes.
This is NOT an affiliate link, but if this looks like something you’re interested in, you can get the set here.
Is this something you think you could use?