#46 - The green box with then "O" is too dominant, interrupts the read of the name. Making all boxes the same color IS NOT the answer either. Concept of the boxes is good, just need to find a way to make them interesting yet still support reading "POST". Also, should "SELF STORAGE" be in green instead of gray? Okay as you have it but will the green tie it in to "POST" better?
#48 and 49 - is there any significance to the change in the color within "POST" other than just to add color? It's interesting but lacks the interest of #46. Also, "POST" would need to be bolder than you have it. There is the beginnings of an idea here. #49 visually reads as "OS" and #48 as "OST" instead of "POST".
About #48, the difference in color was to give a minimal "lock, secure" to the "P" and in #49 i tried to give the "within, storage" concept to the word, but i understand what you´re saying about the readability of them.
I will work on #46 to see if i can came up with something more interesting and better with the boxes. Thank you Filipe