Asexual Purple has none of lavender's hesitation. Place it beside black and white for the flag reference, or add cool gray when the page needs a less severe edge.
Tints
#810081
#8e1a8e
#9a339a
#a74ca7
#b366b3
#c080c0
#cd99cd
#d9b2d9
#e6cce6
#f2e6f2
#ffffff
Shadows
#810081
#740074
#670067
#5a005a
#4d004d
#400040
#340034
#270027
#1a001a
#0d000d