The White Stripes were for for the final Berlin operation and yes they were on ISU-122, ISU-152, ISU-122S(which there were ALOT of) Lend Lease Shermans, T-34 skis, etc.... they didn't seem to be on SU-76s though. The reason they were marked this way was for to lessen the chance of air attack by Allied pilots. They were some reports of the Germans using this scheme to confuse Allied pilots, but I have never seen photos - I always thought it would be interesting to see a Panther or Stug painted up this way.....
Chris