The 63" chevy rear spring swap is a popular choice. It typically yields around 3 inches of lift and good travel.
For other junkyard parts, in the front you can use F150 coil springs from a TTB F150. You need to modify the coil bucket slightly to accommodate the larger springs. This typically yields 2.5-3 inches of lift. But your tires will be a bit off camber unless you get drop brackets for the beams.
Here's a link to some other basic budget lifting stuff. If you haven't already, spend some time at therangerstation.com. Go to their Technical Library page and sroll down, they have all kinds of great info on lifting/building rangers. That site was a valuable resource when I had my ranger.