For Ludum Dare #31, I made a 2d shmup in unity, where I generated all the graphics via code – The 2d graphics are actually 2d models, with all the vertices & colours dynamically generated using C#. Because of this, the graphics are pretty simple, but in motion the game is quite pretty!
Ludum dare entry here: http://ludumdare.com/compo/ludum-dare-31/?action=preview&uid=7085
The web builds are using unity’s old web player, so most likely won’t work in any modern browser, but the downloadable builds should still work! Give it a go!