Old things made new. That's a broad category for any topic, especially in sewing. It could mean upcycling fabric or clothing; refurbishing furniture, or overhauling a sewing machine. Sometimes making something new is as simple as a few small additions to your sewing notions or equipment.
My PFAFF 1212, made in the early '70's. It's quite the work horse, and though it has a few features such as an automatic stitch cam, it lacked in original presser feet until I found adaptors.
A shank adaptor and the extra presser feet (snap on) open your sewing machine up to a wide variety of stitching capabilities: overlock stitch, embroidery, smocking, ruffling, etc. If you know your machine well, most likely you can perform these stitches without the new presser feet; however, why make it harder than necessary? The new presser feet available make sewing a breeze without laying out hundreds of dollars for a new machine.
There are two adaptors: long and short. Examine the pictures and notice the difference between the long and short adaptors. Each is designed to fit to the shank on your machine - long shank for short shank machines and short for long shank.
Thread is an important part of giving your sewing some pep. Paying careful attention to the type of thread, matched with the right needle and fabric, sewing just took a turn from drudge to fun!
Of course, selecting the thread that's right for your machine and project can be a little overhwheming with different weights, sizes, uses and preference of brand. Sort through the confusion quickly by using thread guides and charts, available for free on most online notions stores.