Maybe Not Custom
Well, maybe we won't be doing a fully custom theme right now. I realized how little I know about Bootstrap, and even less about how to use it with a templating system like Jinja (which is what Pelican uses). I'm not giving up, though. It's definitely something on my list.
What Is This, Then?
This is a pre-built theme for Pelican called Blue Penguin Dark. I like it because it actually already fits with the color scheme I'm looking to implement in the future. So I can use it as a jumping off point. Maybe I'll even use this theme as a base and customize it as I need to.
Next Steps
I can already see one thing I'm going to customize on this theme, and that's the date format for posting. It currently lists the posts by time, which I don't (currently) flag when I create them. So I'm going to make it reflect the date instead. If I decide to include timestamps, then I'll update to that. But for now, as frequently (or infrequently) as I post, date is more than enough granularity for me.