#750787 carries the shadow end of a rainbow palette. It looks especially good beside light pink or cool blue, where the purple keeps the composition from floating away.
Tints
#750787
#832093
#91399f
#9e51ab
#ac6ab7
#ba83c3
#c89ccf
#d6b5db
#e3cde7
#f1e6f3
#ffffff
Shadows
#750787
#69067a
#5e066c
#52055e
#460451
#3a0444
#2f0336
#230228
#17011b
#0c010e