http://revach.net/article.php?id=4103

Section: Taryag Mitzvos   Category: Mitzva Opportunity
The Chazon Ish's Succah Walls
The Zohar says, "Everything needs its Mazal including the Sefer Torah in the Heichal."  The Chazon Ish used to buy very expensive walls for his Succah, in time when, as he said, people were content to find a few pathetic slats of wood that had no shape or form, from Hefker.  Yet on the other hand they are willing to pay a king's ransom for a beautiful esrog.

Succah is a mitzva for which you are chayav to beautify, "Zeh Keili V'Anveihu", no less than the Arba Minim, said the Chazon Ish.  Moreover he says, when Chazal give us examples of what it means to beautify mitzvos, first on the list comes none other than "Aseh Lifanav Succah Na'eh", make before Him a beautiful Succah!  (Chaim SheYesh Bahem)