i have had a few ideas about this (see below thread, i'm making one myself) personally, i think i will go with black ABS with silver edging and logo, a quad air inlet (very hard to find, will probably have to rape 2 Y peices). it was either that or find a place that did glass/Lucite/Perspex tubes that size

i also toyed with the idea of making one that doubled as a CD rack, lamp, computer desk (whole thing made out of ABS with two back legs as 6ft tall evap towers

).
I even treid to steal a 1ft diamiter drainage pipe from soem roadworks near me, it was the exact shape needed, and even had the endcap in the right place. unfortunatly, by the time i had gotten suitable transport to collect it, it had been crushed under a JCB. it was a very nice bright yellow colour, so i could of gone for a Radioactive theme.
Just so long as you dont totally bodge it together from scraps and tape, it will look fine. give it a lick of paint, use fan grills on the in/outlet, cut out a section of the tube, and put some thin (bendable) perspex over it and seal it in place with ATV Silicon/plasti-glue/epoxy(so long as its clear and wont show), put a bit of edging round it, or go for the industrial look with stick on rivets. if you cant find a glue that wont show, you can place it on the inside (hard work i know, but till probably be worth it. then you will probably be able to put a few LED's in the top of the tower (you wont even need cables on the exterior, just find som suitable outdoor cables) just run the up the inside, and viola, you will have a internally lit windowed evap bong
i think i will start building one tomorow