Photo and tutorial (click through for link) by Chastity at Pearls and Mason Jars
Not just a good exclamation when you're angry, these are a simple fidget toys you can make yourself. Click on the pic above to go to a great tutorial on the blog Pearls and Mason Jars.
Grab a pack of balloons, some sandwich bags, scissors, and filler- I like sweet rice, lentils, or playdough to fill mine. A lot of people use flour which can work well but can also get messy to make, or if they break later. There are a million tutorials online for different versions of these. Here's a good video for a slightly more complicated flour version. I like this because it shows how you can make polka dot patterns by cutting up the outside balloon:
This video shows you how to use plastic bottles funnels to fill a balloon with flour, then put other balloons around it to keep the flour in and make it stronger. This will make your squishiest, most moldable version of the ball. However, it's simpler to fill a sandwich bag with the flour and twist it closed first, before dealing with the balloons. Pulling a balloon around that is easier to manipulate and also less messy if you screw up. The blog that's linked in the first pic shows this version.
I've made them this way with groups and individuals. People have taken the idea home and made them with the whole family. They're good to squeeze and mold if you're anxious, bored, or irritated. They're fun for juggling practice too.