Reusable Components Appian

Question

I'm planning to create some reusable components in Appian. I've already built several, including reusable forms, page headers, message banners, empty state (no data) screens, date and currency formatting utilities, and a few others. 
 Can anyone suggest additional reusable components, patterns, or expression rules that would be useful across most Appian applications?

Mike Schmitt · Answer

A few of my favorites that I've come up with myself for my own use and use across my project: 
 
 a datetime field in a side-by-side with an icon that gives the user a 1-click target to fill with the current date (or datetime) 
 a file upload field that doubles as a read-only file preview field (predating the recent updates to the file upload field offering the "preview" pop-up) with a rich text icon saving the linked document ID into a local variable to show it within a preview field 
 a universal preview field which detects the file type (PDF or image file) then opens it in the relevant on-form viewer, if possible, and defaults to a download link if incompatible