In small bowl mix together butter, garlic, cajun seasoning, and thyme.
In large pot bring salted water to a boil. Put potatoes in water and cook for 10 minutes, with about 5 minutes place the corn in the pot. Drain both once done.
Place potatoes, corn, shrimp, and sausage onto skewers.
Cook on grill for about 8 minutes turning half way through.