Rogue__Hero: These are ideal for a coffee table. In fact the hardest job is now fabricating the table!
I'd suggest the square modules as they are very bright. The table would work well even in bright ambient light. You could easily use each one to illuminate a "cell" on the table up to 5" square.
In my example video I've used the smallest LEDs and they illuminate a cell of 2.5" with ease, but in sunlight it gets washed out somewhat.