On 4 of the wooden skewers, layer on a blueberry, blackberry, blueberry blackberry and follow with mini marshmallow, raspberry, another mini marshmallow and one last raspberry.
On the remaining 7 (or more!) skewers, layer on 5 raspberries and 5 mini marshmallows, alternating between the two.
On a tray or platter, lay out the skewers in an American Flag design, the blueberry/blackberry skewers first followed by the marshmallow/raspberry ones.
This "recipe" is very flexible, you can use strawberries, just blueberries, just blackberries, more or less skewers, etc. Keep chilled until ready to enjoy!