You'll have to edit the actual texture. Make the edges transparent so when it overlaps a texture it looks like the textures are blending.
This may give you your ice effect.
But if you want the entire texture to look icy, you can copy the ice texture you want, paste it ontop of the brick texture, with a program like GIMP or Photoshop you should be able to set the Opacity of the eraser, set it to your liking, this will blend the textures quite nicely.