You are purchasing a fun VSEPR theory activity for students to learn more about bond angles, covalent bonding, and drawing Lewis Dot Structures! To make things more challenging, have students use the reference sheet to look at what the structures should look like and then have them think of their own molecules that would resemble the structure. Have them put their structures on a napkin and write out the formula in front of the napkin. If you want more accuracy, provide them with markers so they can also draw lone pairs on the marshmallows =)
All you need are napkins, markers, toothpicks, and small marshmallows and you're set!
Note: I also sell a student VSEPR practice worksheet to teach students about VSEPR on my page.