Mr Screen

The circular light fixture from Pink Floyd shows.

30 intellilights around the rim, by the P.U.L.S.E tour it was moveable from vertical (circular screen behind stage) to horizontal (halo over Gilmour). Maybe 10m diameter?

From wikipedia:

A large circular projection panel dubbed "Mr Screen" first made an appearance during performances of Dark Side of the Moon in 1974 and became a staple thereafter. Specially recorded films and animations were projected onto it, and for 1977 "In the Flesh" and 1980-1981 "The Wall Live" tours, coloured spotlights were fixed around the rim, an effect which reached its zenith with the dancing patterns of multi-coloured lights in the A Momentary Lapse of Reason and Division Bell tours. In the latter, the screen could be retracted behind the stage when not required, and was tilted with its peripheral lights focused onto the stage into a single spotlight during the final guitar solo in "Comfortably Numb".

See here some of the visual effects it can do (as well as referring to concert footage, of course) http://dorseyland.blogsome.com/2007/04/19/lightning-on-the-dark-side-thunder-on-the-sun

So, could we make one for a home theatre?

36 mini-intelli-lights, USB controlled? We'd want no more than about 400watts of lighting I think... so let's call that 360watts and make it 10watts per light. This is quite USB achievable I think.

With a diameter of 3metres for a home theatre, that is a perimeter of 9.4metres - which gives us 26cm per light.