They're part of the Merry Mushroom line of kitchen items sold by Sears in the late 70's and early 80's, and she's picked up a number of the other items from the line over time. So, I decided to use them as inspiration for her Mother's Day present.
I made these potholders using this Mushroom Potholder pattern from Lion Brand Yarn (the pattern is free, but you have to sign up for an account on their website). The bell of the mushroom is worked in the round then flattened, and the stem is a doubled-over strip of single crochet. So, the end result is very thick. I didn't actually use these since they were a gift, but my guess is that they would work really well as practical items as well as decoration.
As you can see, they turned out different sizes due to varying tension leading to different gauges. To coordinate with the Merry Mushrooms colors, I used Hobby Lobby I Love This Cotton! in Burnt Sienna, Brown, and Woods Print.