The provided screenshot is greatly appreciated.
After a brief investigation of the Visual Style Builder tool, I found that the blue palette is not added to the dialog drop-down list, because the blue color is the default for the Crystal theme. This dialog is offering options to change the accent color to a different from the default one.
If you want to modify some of the colors in the default Crystal theme I can suggest you use the color blending: https://docs.telerik.com/devtools/winforms/tools/visual-style-builder/working-with-visual-style-builder/color-blending
Additionally, this it the list the colors of the default blue palette:
Normal:Gradient from 86,169,253 to 8,126,255
MouseOver: Gradient from 37,144,251 to 0,114,238
Selected : 28,131,255
Basic: Gradient from 35,144,253 to 0,82,230
Should you have further questions please let me know.
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