Copy and paste this code on English Wikipedia to get the above box:

Select Code Output Method {{Userbox}} Template Substituted {{Userbox}} Template Raw HTML (Doesn't work in IE)

This is version two of the script used to create userboxes, written by me, the English Wikipedia user The Userboxer. All questions, comments, complaints and death threats can be directed there.

Limitations: Since I don't have time to make it too fancy, MediaWiki markup will not be rendered. You will have to put them in manually. Sorry.

Also, the generated code will only work if the Userbox template exists.