This isn't really about yarn, but it seemed worthwhile to write about.
Recycle your flawed t-shirts into wearable ones:
Make an empire waist / babydoll tee or sleepshirts.
You will need a sewing machine, at least two t-shirts that are somewhat similar in size and a modest degree of sewing skill. This is an easy project.

• Good candidates for t-shirts would be those with a stain, a messed-up neck or hem, or some other flaw.  Also consider any tee that is too tight in the bust but not in the hips or vice versa. These shirts can be long sleeve, short sleeve, sleeveless or tanks. They need to be stretchy knits.
  
• Look the shirts over and decide whether you like the upper half or the lower half the best.  You will need one of each and you will want colors/designs that go together in a way that pleases you.  If you're cutting off Sponge Bob's head, you might not like it, then again...

• Let's pretend Shirt A is too short for your liking and Shirt B has baby spit-up on one sleeve.  Ewwww.  Fold Shirt B on the dotted line (see tasteful and expensive illustration above) and hold it up to Shirt A in roughly the same location.  Do you like how they look?  Okay, well, do you like how they look better than you like my artwork?  Good enough!
  
• Are they roughly the same width? If not, you may have to take in the side seams on the larger one. Before you do this, try it on and make sure the shirt will still fit if you take it in.
  
• Measure your torso from your shoulder to the desired length of the finished shirt.  Add half an inch for seams. The pieces of Shirt A and Shirt B need to equal this in length, unless the length is not very important to you. ...Oh, sure. You have a nice, flat abdomen or something, huh? I hate you.
  
• Cut Shirt A horizontally across under the armpits. If you cut within an inch of the armpits, you will likely have a seam above the bust.  If you cut 3 to 5 inches below the armpits, you will likely have an empire waist. The lower you cut on Shirt A, the better you will be able to make a long tunic or nightshirt if that is your goal.
• Cut Shirt B horizontally across under the armpits, making sure you are allowing for adequate length. The higher you cut on Shirt B, the better you will be able to make a long tunic or nightshirt.
  
• Turn Shirt B inside out and slip it over Shirt A.  Or if that makes zero sense to you, place right sides together with the raw cut edges lined up and seams matching. Pin the pieces together. Directions continue beneath this photo.

• Stitch a 1/4-inch seam, gently tugging or easing fabric as you go.  If the pieces are close in size, you will find this easy.  If they are not close in size, you probably had trouble with the pinning.  Back up and take in side seams, as I mentioned earlier, but were you paying attention?  NooOOooo.  I feel so unheard.  ::sniffle:::
• I stitch around the shirt twice to lock in the stitch.  Since it is a knit, it is unlikely to unravel.  I do not reinforce with serging or zigzag, nor do I topstitch, because these tend to make the shirt wrinkly and lumpy. Frankly, it may be a little lumpy anyway. The lumps may improve after washing.
  
• Turn right side out.  Now instead of two shirts you hated you have one that you (hopefully) like. .
• As you can see from the photos, I have made at least three of these.  Actually, I have made perhaps a dozen. The first one took me half an hour. Now I can whip these out in ten minutes.
• Try making these for children or grandchildren and you'll get more mileage out of your clothing budget.