I am on my third shop since I started(25+ years ago) and I have already incorporated most of the suggestions above.
The walls and ceiling of my shop are white(or at least they started out that way) I do have a buffer with a tapered spindle.
My shop is 16 x 32 and I have 18 power boxes 13 of them are 110 4 gang and the other 5 are 220v outlets.
One of the biggest changes I made was to put and 8 ft bench sticking out into the shop and put the grinder on the end of it. This way I can move around it freely(from 3 sides) and it is still secure. I had to put a dust shield behind it to keep the rest of the bench a little cleaner, but the grinder is in the exact center of the room and I like that, because its the most important piece of equipment. My shop is insulated and heated and I do have a roll up door on one end. The one thing that my dad gave me grief for is that I have no windows in my shop.
I need a shop elf that cleans and knows where everything should be put

Del