I tried searching the forums but I don't think I searched for the correct words. Found some discussions about DIY panels and stuff. I would prefer to buy something ready made or Ikea-style assembly.

Reverting to Google I found a few specialist sellers like:
ATS Acoustics
Ready Acoustics

Any other ideas? Aesthetics for high WAF is important.
I will need about 12 to 15 panels measuring 2x4ft.

Also drawing a blank on the ceiling options. I have a huge 23x21 ft flat ceiling made of sheetrock.
Axiom M80s + QS8s + VP180 <-- Pioneer VSX-1120-K <-- Squeezebox Touch / XBox360 / Oppo BDP-93