1. Which do you like better, the columns separated into 3 or put together?
Personally, I like the 3 columns together.
2. Does it need a border of white or a color?
White border.
3. would you move any of the blocks or change something?
I think they look pretty good. Maybe consider scattering the yellow HST's a little more - - -
4. What would you do for binding?
White!