assuming by boxes you mean squares in two dimensions its easy. Make the five boxes all next to each other so they share sides then remove two toothpicks here the top and bottom of a middle box and you are left with 4.
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You can make 5 triangles out of 9 toothpicks. With 6 toothpicks, make a large triangle with 2 toothpicks for each side. Now, take individual toothpicks, and make a smaller triangle inside the larger one by joining the midpoints of the sides of the previous triangle. (The vertices of the smaller triangle are the midpoints of the sides of the larger one).
bend 2 toothpicks at 90 degree angles and put them cornor to cornor
make a circle
5 or 6 Depending on what shape you are thinking of
P = 2*T where P = # toothpicks and T = # tiles.