No, I did not make it 256 colors, but I did try out as an experiment how Half-Life 2 would look like at 320x240, a very low resolution by today's standard but once rather standard for gaming.
There is no point to this video except to show how it looks like at 320x240.
One may immediately notice that the lack of antialiasing is rather distracting. Jagged edges of polygons, and what's more difficult to fix, moire artifacts in transparent textures such as the steel grid walls. Adding proper antialiasing, for example by rendering in 4x size and then lanczos-rescaling to 320x240 with a slight sharpening factor, would improve the appearance dramatically. (I tested.)

There is a visual glitch in mr. Breen's video screen, somehow caused by this low resolution. It did not appear at 1024x768 when I tested. My guess is that Valve forgot to add a call to the function, glViewPort (or SetViewport in case of DirectX), when rendering into the texture for the display, causing the texture to be inadvertedly clipped to the display boundaries.

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