City you're going about this 100% the wrong way. Stop asking for media for the project, or help on the storyline, instead, start developing the game's engine (movement, collision, basic gameplay, scoring, game over, menu screen, HUD, basic effects). Once you have the engine around the 70% completion mark, meaning the game is actually playable, not an idea in your head, then move on to asking for media or help on the graphics side of things. For now use primitive DB-Made objects like boxes and spheres as place holders for media.
Ask any programmer that takes their job seriously, and theyll tell you that a good game engine is 3/4 of the work, graphics/media is meant for last touches to make the game look good, AFTER it plays good.
Plains can be place holders for particles, boxes for walls, 2d boxes for hud elements, spheres for players, matrices or terrains for ground, boxes for snowmobiles, etc.
Ok? No more asking for media before the engine is fairly far in development?