I have just bought myself a set of 3 Pilot Parallel pens. They're great fun, and absolutely ideal for grabbing and playing around with in the few minutes when my daughter is quiet or napping and I don't have time to set myself up for a long writing session. These were done with the 2.4mm pen and a cartridge of the violet ink that came with the set.
As you can see, we've been celebrating Burns Night!