Type - pentecost grid::blog - into google and you find all kind of ideas for creative worship.
Not that it was high in the creative stakes but here is what we did for part of our time together in worship yesterday. We used a flickering flame loop as a projected backdrop and used a wind machine from an inflatable castle thing as we sang 'Our God is an Awesome God...!'
More fun I suspect than creative - seemed safer than the 2 ft meths soaked pumice stone idea!!