Christine: why not paint plum underneath --- then blue... and then distress with sandpaper... so that the plum shows thru.
Are you asking how to match paint colors you saw elsewhere?
Christine, I'm not sure what you are asking here. Do you want ideas on what kind of paint to use? How to paint it? Please provide a photo and let me know what you want the end result to look like so I can try to help you.
Paint the cabinet entirely plum. Tape off the area that you want to highlight and paint the rest blue. Use painter’s tape to mask off the areas where the highlights are going to be.