I used a 50/50 silk/merino blend dyed by Beata over at Hedgehog Fibres. Coincidentally, I first encountered (and subsequently fell for) her work through Stephen's projects. I don't presume to be a good spinner, so I'm glad to have a nice fiber that kinda makes up for it.
For the grey, I used Jamieson & Smith Shetland Aran, having been itching to use it since I encountered it. That's about the only itching involved, for while it seems almost rough compared to the silk/wool, it's actually really soft. However, it seems like it could felt easily, so I opted not to use it for the i-cord drawstring. Instead, I experimented with chain-plying a thicker-spun single.
Oh. And for those who care, happy Valentine's Day. For those who just want chocolate, eat your heart out.