The old board had icons available at 100x100. There was never any hue and cry about the dearth of iconographic possibilities before. I'm certain that if there was a 150x150 limit someone would extoll the vitures of the 250x250 icon-- which is surely ample.

Let's go with 100x100, which was the icon limit of the old board. Most of the people on the new board haven't even registered an icon at all. Let's see what happens.....