Wicked idea Splash!
Jazz 3D can look good, this is what i did.

1)Make a shartcut to the Jazz3d.exe and in the target whitch shows that path to the .exe add -safe (so its some thing like this C:\Games\Jazz3D\System\Jazz3d.exe -safe)
This will allow you to play JJ3 in direct 3d and not software mode.

2)Load JJ3 up and set the brightness to 50%
3)Change the screen reselutuon to 800x600
3)Your all set, now play Jazz 3D in good grapics

Look @ this pic to see