YOU NEED:
-cupcakes (i´ve done them some with chocolate, some with vanilla, some with nuts...
-orange and black icing, and gelly green icing
-sticks of licorice
-sticks cinnamon
-orange sugar

its simple! you just have to look the pic that i´ve uploaded and copy ^^
-for the little spiders i used the black licorice as the legs, and little candys for the eyes ad black icing.
-for the pumpkin cupcakes first put some orange icing on the top and then orange sugar, draw some lines from the center to the edges and put on the middle a cinnamon stick!
-for the other i just took the black or orange icing and draw some skulls or spiders web or witches hat or whatever!!
i hope you like it!:)