I have grown to rely on being able to change the particle size via Strand/Particle - Blend texture…
Normally in the Texture tab under Influence, there is a checkbox for “Size”.
In Blender 2.72, it is gone.
Does anyone know if it was just moved or removed?
I found the answer by staring off into space (Blender UI) for a while.
The emitter cannot have a material + texture because then options are missing from the texture tab.
After I deleted the material from the emitter and re-added the texture alone, then the “Size” option was again visible.
YAY I DON"T HAVE TO REVERT!