At OpenIDDevCamp we discussed a number of basic interfaces that might be encountered in the course of logging in to an OpenID consumer. Broadly, we settled on three classes of interfaces, primarily classed by size: 

• full page (as in MoveableType or WordPress)
• boxed/comment form (on most blogs or login pages)
• single line (as seen in some headers) 

Examples 

Full page 

Boxed 

Single Line 

Other 

Forgotten OpenID/Account