In addition to all the above metioned ideas, try some alpha-channel driven specularity and/or reflection on the surface of the object and position it so that it corresponds to the water/object intersection point/line, giving and effect of wetness ect, also have your objects texture customized in respect to colour so it appears "wet"....The real world Bryce2 (and probably the lastest addition also) book also has some good ideas to offer on this subject...