I use pretty inks in my fountain pens. I only use black or blue ink if, for some reason, it's absolutely required. I think using colored inks are a good reflection of your personality. I use a few inks by Diamine, a British ink manufacturer.
This ink writes really well, doesn't seem to smear under normal use and is nice and bold. It looks lovely on a white page and I do believe some artists would enjoy drawing in this color.
This is such a nice shade of purple. If you are someone that doesn't like to use colored ink, this might be a nice option for you because it's so subtle. This is certainly a more masculine shade of purple. I would love to see a man use this ink as his signature color. I envision he would be tall, dark, handsome and confident. But that's just me.
Here's the Ruby: