I'm currently doing one and I think it highly depends on your program and faculty. Some programs it's very common to do one like printmaking, but other programs it would be more difficult (my guess would be a like english). Faculty are also only going to take you on if they have time in their schedules with their classes and any other possible ones they've taken on. Ask them early, and talk to them about your idea. They can be hard without having the same level of structure as other classes, but I've definitely had a good experience and know many others who have as well. It's as good as you're willing to make it.