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Concrete and Wood Slab Table
This is an awesome idea! Putting them on strings strung across the ceiling is brilliant. Since they are hanging on strings you could add some motion to them with a traditional crank ghost mechanism and make them even more realistic :) adapting something like http://makezine.com/projects/flying-crank-ghost/ to just very slowly add and remove slack from 3 of the lines across the room should not be difficult, though hiding the mechanism might be, you might have to run those 3 strings up from behind a couch and through some eyelets as opposed to mounting it on the ceiling.
You don’t actually need to spray anything to kill them, just leave the fan running and the airflow will desiccate them and kill them over the next few hours. Thats how those fancy propane burning mosquito traps kill them. I’m going to build one of these tonight and give it a try!