Primping:

Sometimes in the process of installing and removing drives and expansion cards, openings are left in the computer case.  For example, if you remove an installed CD-ROM drive, you will be left with a gaping hole in the 5.25 inch bay where it was mounted.  Most cases come with replacement covers which snap into place to cover up those holes.

VIDEOS:  5.25 inch face plate (CD-ROM and DVD bay cover), 3.5 inch face plate (floppy bay cover)

If you remove an installed expansion card, you will be left with a hole in the back of the case where it was mounted.  Most cases come with replacement covers which screw into place to cover up those holes.

VIDEO:  Case back panel metal strip

Some PC makers tie down all of the loose cables and cords inside a PC.  This can be helpful in that it prevents IDE, floppy, and power cables from stopping the CPU from spinning, with can be detrimental to the computer.

VIDEO:  Cable wraps and primping