To be honest, in terms of not adding content but sticking to the original graphics and so on... the answer is almost no. At least, that's the case for me.
I haven't wanted to use anything except Reunion, which does include some Team Avalanche updates but The Reunion is generally just the original design with better alignment (graphically speaking). The Reunion also comes with a full model overhaul by various people and now maintained by Kaldarasha.
The only thing I can think of that I use besides this mod is FeliX's world map update - but it needs to be completed.
In terms of not sticking to the original style, one day I may play New Threat.