One of the ladies in my knitting group works at a school, and last week she asked the group to knit some hats. In cold weather, the teachers do not allow the students to go outside for recess unless they can prove they have a good coat, gloves, and a hat. Many of the children did not have hats.
I told her I had two hats made and would bring them to knitting this week. Then, I found some oddballs of wool yarn (what a shock, right?) and made a few more. The yarn balls in this photo made the following hats. (I did add a bit more white to make the hat in the top left)
It is difficult for elementary children to be inside all day. Now, at least eight will have the chance to go outside and run off some energy. Check with schools in your area to see if they need some hats.
A quick note to answer a question: I use my postal scale a lot. I weigh a finished item to see how much I need and then find close to that amount in my scrap bag, but even so, I've come close to running out of yarn for a scrap-yarn project.
The striped hat in the upper left is a prime example. I knew I would not have enough of the green to finish in the same color combination, so the top of the hat, I knit three or four rows of white and one one row of green. It is not that noticeable unless you really look at it. Other times, I just grab another color and make the item even more colorful.