User blog comment:Kirkburn/Turbocharging the Mobile Experience/@comment-24634078-20180322182053/@comment-25653892-20180322183057

I can understand why staff don't want the mobile skin customizable&mdash;it undermines all the optimization they're doing to make the pages load quickly. That said, I do think just two features would be nice: background color, and accent color.

The former would be useful for wikis with dark background skins on desktop, where contrasting icons are likely to be pure white, and thus invisible on the also-pure-white mobile background. A simple "Use black background on mobile" checkbox in the Theme Designer would work wonders. The latter would be less useful, but it would allow different wikis to stand out and look more distinct.