I added an Undercover Elite Tonneau and GM cargo bed extender cage (AMP Research powdercoated black) along with factory floor liners and I did Sealight LED conversions for the low beams, high beams, and foglights (yellow) as well as LED license plate lights. Truck looks much better and has much more functional storage now. I need something to put in the front of the bed to can hold some jackets and hats and coats and other emergency gear the wife likes to keep on hand, since this is her daily driver. I have to say, I was bummed out initially getting a Colorado since I wanted a Ranger badly, but this has me pleasantly surprised. I figured the 3.6 would be a dog compared to the 2.3 in the Ranger but it really isn't bad!
That is about all I'm willing to do for now for mods since it is a lease.
I can get most of my money back on the tonneau and cage if I end up trading this in and the bulbs are easy to pull out and replace with stock.
Loving it so far!