Hi Keith  
 
This is one way  
 
on menu go to 'Edit' then select 'Canvas Size'
 
at bottom of this menu window that pops up there is a drop-down menu for 'Canvas Extension Colour' - choose the background colour you want
 
Then check the 'relative' box
 
Then say you want the drop shadow bottom left of frame - click the top left square in the box of cubes and arrows you see - this will then change the direction of the canvas change to extend towards the bottom right
 
Then finally select in the 'Width' and 'Height' boxes the size you want to extend by
 
Then ok -- and it should do the job
 
There may be other ways but that's my method
 
Hope it helps
 
Jonathan
 
 

Hi Keith,
 
In Adobe Elements, the dummys version of CS,  there is a an Effect/Filters menu there you can add effects to your photo, one of which  is drop shadows. I'm pretty sure CS has a similar feature.
 
Another way to create a drop shadows is to create a new photo with three layers, the top layer being your picture, the second a simple black box (your drop shadow). The last and bottom layer being the original layer.  This way is a bit clumsy, it's easier to just use the effect/filters menu.  This menu will also allow you to create preformed borders...
 
DanC