Example projects are available to load from the Samples/Realman menu.  The scripts are embedded within the appropriate material.  You can un-embed and save the scripts for study or modification.

fire_anim.r3d illustrates the use of curve and noise objects to create a volumetric fire material.  Render the animation to see what the material produces then experiment with the script and develop your own fire effects.

A frame from the fire animation.

threads.r3d showcases a flexible script for generating screw threads by surface displacement. The Script Options feature is used to select the thread profile.

A triangular-profile thread

windowhi.r3d is an attempt to emulate a classic Renderman® shader that gives objects a window-shaped highlight without tracing secondary rays.  Play with the animation slider to rotate the camera and see how the highlight behaves.

Edited highlights?

splat.r3d throws random bitmaps onto a surface to create a non-repeating pattern. Of more interest though is that the script is written using the primitive 'object oriented' features of the Realman language which are currently undocumented...