Easy enough to make, this wire spool rack was made from two old shelves and some wood dowels. #22 stranded is used for many general-purpose prototypes. Ten colors:
500 foot or 1000 foot spools. The spools are a reasonable price and tend to last a long time when used for prototypes only and not production. Along the bottom of the bench (not pictured) are several yardsticks. The loose wire end can be pulled along the bench to cut the wire to length.
Make: Magazine has posted a simpler way to make a -smaller- wire rack here: http://blog.makezine.com/archive/2010/09/collins_lab_wire_rack_attack.html