01The channel bannerdark · the defaultMark, wordmark, one sentence, one schedule line. That is the whole banner. It answers the only two questions a visitor has — what is this channel, and how often does it publish — and the hairline rule between the lockup and the copy is the same device the site uses to separate a name from its description. The wings carry the pattern outward and nothing else, so the phone crop above loses no information at all.
02Lightsame geometry, swapped paletteThe same layout with the palette swapped, not a second design. Worth having: YouTube's own dark theme puts a navy banner against a near-black page, where the top accent bar is doing most of the work of separating them. On a light channel page the dark banner wins; if the surrounding page is dark for most of your audience, this one reads better.
03Course launchtemporary · swap back afterLeft-aligned, because a title of this length centred is a title nobody finishes. The mark comes off — the avatar directly beneath it is already saying whose channel this is, and repeating it costs the room the course name needs. Set a date to swap it back on the day enrolment closes: a banner still advertising a launch three months later is the clearest possible signal that nobody is home.