I gave this some thought in the past, and, since this is more of an artistic/crafting endavor than anything else I'd say we decide on some arbitrary rules (like "only monospace fonts, no external javascript, only static content", I don't know, I'm just spitballing here) and create our own certification to display at the top of the page (like the omnipresent top-right oblique ribbon of yesterdecade or, even better, the little badges we used at the turn of the century), then we make a central list where people can add their website.