If you are interested in that type of tank, check out
Hoosier Vapes. They make an acrylic-based cartomizer tank with the one-piece top that can be easily removed for juice filling. The Bella series uses standard size carto's and the Elegance line uses XL length carto's. Each tank is unique, one-of-a-kind. They come with a polycarbonate-type tube.
There is a thread devoted to the Bella tanks here:
http://www.e-cigarette-forum.com/forum/tanks/316886-show-us-your-bella-tank.html
Phiniac makes a clear pyrex tube that will fit both Bella and Elegance endcaps. These pyrex tubes can be sandblasted with designs or have custom hand-blown-glass designs applied. The colored tubes offered by Phiniac WILL NOT FIT the Bella/Elegance endcaps as they are a larger inner diameter.
Phiniac Rugged Pyrex Glass Tanks
Below is my Elegance tank from Hoosier Vapes, with an XL clear Phiniac pyrex tube that I had color sandblasted with a design. The green e-juice is Ecto Plasma from Juicy Vapor.
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click pics to enlarge detail