Vignette Camera Effect on Unity Free?

Hi, I’ve been trying to get a vignette type of effect for my FPS camera, where the edges sort of fade darker. I noticed that image effects are Pro-only, so I tried to put a vignette to transparent texture onto a plane, and it didn’t work out too well. Is there a way to achieve this on Unity free version? It would really add to the atmosphere of my scene.

Thanks.

Unity’s Stealth Game tutorial had something that might work out, they have a screen fader (to fade the whole screen to black), it’s nothing more than a black square texture that’s fitted to the screen via code, Im thinking that if you replace the texture with a vignette and adjust the conditions that trigger it you could manage a very similar effect.

Here’s the tutorial: