Hi Mike,
The ArcPad Picture Page is one of the Pre-configured Pages in the Edit Form, along with your Attributes, Symbology and Geography Pages.
These pages cannot be edited but they can be toggled on and off, either by setting the 'picturepagevisible' to true or false in the Tree View of your Edit Form or by checking the boxes on the Form Properties dialog when using the Forms Editor in ArcPad Studio.
The Picture Page is pre-configured to provide users with a picture preview, a drop-down box to select the photo field in your data, the ability to rotate pictures 90 degrees to the left or right, a button to launch the camera and a button to browse and select an existing photo. It can be used to capture new photos or view existing photos that are associated with your data.
The design of this page aims to make it easier for you to incorporate photos into your project by simply turning the page off and on.
If you want to build your own version of the Picture Page, you can add a page to your form and customise it to capture photos using the 'imagebox' control, but the out-of-the-box solution is pretty awesome in my opinion!!
HTH
Hannah