There is not a way to switch the icon. Maybe write that as a new post in the Ideas section, because it sounds good. Especially if there were a variety of icons you could select or maybe select different icons for different states.
As for building up devices... I have quite a few, but most have been bought on sale/clearance or eBay. Only a couple devices have ever been full price.
Now that you have me thinking about it... I really should do an inventory.