Lava? Yes. I've seen people use the Mushroom skin texture for lava rather than the clear texture. The texture name is swgiantmushroom1_ny. Go into surface inspector after selecting the brush you apply the swgiantmushroom1_ny texture to then set the check box next to the
No LightMap option to CHECKED to give the lava that glowing effect. Make sure the texture name in the Texture box of the Surface Inspector says: new_york/swgiantmushroom1_ny before applying the settings. As for clear water textures, be sure to set the
NO CSG flag in Surface Inspector to CHECKED.
Hope that helps.
