Heres the easyiest way to get a different look in your map
First with your map extracted you need to make another folder in the main map folder and name it "customtextures"..without the ""
now put the textures you want to change in the customtextures folder
now open photoshop or what ever program you use to paint with
now go to the customtextures folder and select the .dds files to be painted
now paint away and when done do a "save as" and select the origional .dds file of the picture and save it..
now in the main map folder in the init.con file you need to add a line to get the textures to show up..this is what it will look like when you get done
textureManager.alternativePath ../../bf1942/levels/map name here/customtextures
now pack up you map and se if your new textures are showing..