New Trap Idea: Fools Gold
Thought it would be cool if there was a trap that would attract goblins and explode, hurting or killing the goblins attracted to it. This trap could be an always visible structure that resembles a random resource structure, or one that appears when goblins enter a certain trigger radius much like any other trap. It would be armed using gold like any other trap. Maybe you could consider loading it with real gold to get the goblins' attention. More gold (or higher level) creates larger trigger radius or attracts more goblins if you would choose to limit the number of goblins that would be attracted to it. Just a thought. Hope you can put it to good use. :)