which additional colour should nightshade have in his mane and tail

i am having a hard time deciding which additional colour to put in nightshade's mane and tale (as a stripe, similar to what twilight has in her mane and tail) , so because of that i am asking everypony to give me there opinion and help me decide. due to the limit of answers i have put them in to sets, so could everypony put down their choice in the comments below, thank you