Not sure if this is known or not but using either DOSBox (ykhwong's version) or Glidos you can play Tomb Raider in almost any 4:3 or 16:10 resolution using nGlide. The author of the application opted to not stretch the image so for me on a 16:9 screen I use a custom resolution to display in 1080P using a 16:10 resolution

For DOSBox:

Run nGlide and setup your resolution.
Rename or delete glide2x.dll from the DosBox folder (I recommend backing it up)

The Glide2x.dll file needed for replacement is found in:
C:\Windows\System32 (32-bit users) *Or the System folder I'm not sure*
C:\Windows\SysWOW64 (64-bit users)

For Glidos:

Run nGlide and setup your resolution.
In the Glidos folder locate the OpenGlide folder and replace the glide2x.dll (back this one up as well) with the nGlide version once you setup your resolution.

Screen grab using Vista64 and Glidos

Edit:

Texture packs don't seem to work using Glidos. Not sure if it is the application or the resolution I'm playing on but you will get garbled textures.