I was fooling around with the PhongE shaders to see if I could get softer highlights. Instead, I ended up pushing them in the wrong direction, by increased the roughness parameter. After seeing an interesting result, I cranked it up to 3 and increased the highlight size, too.
The result was this image! I rather like it, though I doubt I'll do anything more with it, at least not on the character models. An interesting effect. Looks more like something you'd see in Photoshop than on a 3D model.