This is a userbox for editors who consider themselves de facto participants in every WikiProject, on the basis of WP:Ownership of content, WP:No vested editors, WP:MERCILESS, and WP:LOCALCONSENSUS, and reject the idea of "membership", as if they were exclusive clubs (which do not have a successful history on Wikipedia).
WikiProjects' participants lists are for identifying regularly active participants in a WikiProject to collaborate directly (if they wish to be contacted for such purposes right now); they do not exclude anyone from participation or from having their views considered equally. See WP:Consensus policy: Consensus is formed, anywhere and on any topic, by which editors care to participate.
Put this template to your user page.
|nocat=y– suppress categorization
See the source code for additional parameters if you want to tweak the appearance (colors, etc.)