You can use larger or smaller cups or eyes, however the ratio of eye-to-cup size will change.
You need three eyes per cup.
Get the lime green paper cups here! Or plastic cups here!
(The plastic cups are larger at 12 ounces, so you will want to increase your eye size to 15 or 18 mm).
Get the googly eyes here!
If you buy self-adhesive eyes, you may not need the hot glue gun
. Just check to make sure the eyes are secure with the self adhesive and do not easily fall off.