Design of 200 images/symbols

We need your graphic design abilities for our webbase city-simulation game. There will be 200 png-images to be designed at the first step. - buildings (51x51 px) like city hall, solar plant, nuclear plant, etc. - ressources (20x20 px) like wood, fish, meat, ore - a little amount of other images all buildings should be in the same style and not (!) copied from any other ressource! our game is commercial, so we need our own graphics! when we are through this bidding thing, we will need an example building of you to decide if we go 2d or 3d together. if you have some example before, that would of course speed up the whole thing and we can award the project to you faster. any questions? pm us =)