The original painting frames have a couple of problems. The most obvious one is that the texture warps as object moves around on screen. The other one is that the frame looks quite unsubstantial.
This package "squares off" the texture mapping, and makes the frames look more solid.
There are two sets of the improved versions. Example of one improved frames is below.
To download the ones that overwrite the originals, click Here
If you're making your own FM, and you want the player to be
able to see the back of the frames as a solid texture (e.g. like the painting in
the 'Crystal Eye' puzzle in Shipping and Receiving), click
Here
There are installation instructions in the .zip