All things remaining equal (Performance, ergonomics, etc) I go for the bright colored hand powered tools. For me its a visibility thing. Take for example building a fence. If you are using a Hitachi drill and leave it on the grass while you get more pickets, you might have to search for it a bit. Same thing with PC on concrete. The same drill in Dewalt Yellow screams "Here I am!"
I also go for bright with garden tools. The orange-handled spade shovel I have is less likely to rust out in the yard or be eaten by the lawn mower like my wife's green-handled hand shovels.
Full-sized tools? Who cares! If I trip on them or can't find them I have bigger problems to deal with. Also, they won't even fit under a lawn mower, so that's not a concern. :)
Hey, that makes me wonder.. How come there are no Gas-powered table saws ;) 3HP Unisaw? Bah, I've got a 7HP Tecumseh!