I did a web search for Jackson Pollock. Wow!! I noticed a few things.
1. People actually BUY this stuff

... WOW!
2. Most of his work is on a white backdrop/base. I thought about this, but black seemed more appropriate for speakers.
3. Folks who have seen the speakers in my home always seem to comment without being prompted, but the comments are always something like... wow, that's really neat! I think they would look great in my kid's playroom.
You must have a damn big router !
Well, this did present some problems. My old Rockwell router managed to spin the large radius bit, but the speed was frightening

! The bit created a fan-effect and a growl at 22000 rpm. Fortunately, the bit was balanced very well and the vibration was minimal. After about 2 passes with this arrangement I decided this was a very bad idea. It was dangerous and spinning the bit at this speed creates a cutter-head speed that is far from optimal.
So, I decided to go to the tool store. There is a dandy tool store about 5 miles from here.
http://www.tighton.com/ . The folks there allowed me to turn-on the routers (most were fairly quiet). Unfortunately, NONE of the routers had a metal base (the structure) large enough to allow the 3 1/2" diameter bit to physically pass through. I eventually decided to purchase the Makita 3612. I ground about 3/4" of aluminium from the base with my die grinder. Then I used the carbide router bit to cut through the last portion of the aluminum base.
I really enjoy the new 3612 Makita router. It is VERY quiet. It is VERY smooth. The adjustments are really slick. The slow turn-on and slow turn-off are also very nice. And, I can swap bits with only 1 wrench. The Makita 3612 is monumentally better than my 30 year old Rockwell and 10 year old Porter cable routers.

Dave