im not sure about you guys but with all the misc junk i pick up i love themeing buildings.

for instance il put empty soda bottles and extra food supplies in one to make it look like a market

That's a pretty neat idea, in FO3 my ex-box will make safe "Haven"s" for travelers, by putting food items on a table, cleaning the area so it feels safer, then he will put sensor modules around the house, Rped that his pip-boy was actually a BOS device, the modules would have alerted him of people going into the building.

Still don't try anything in New Vegas, nephews broke the disk *grumbles*

Never thought of that before and I've played New Vegas for 1,000 hours.

I've done it before. Once I put a 9mm by the hand of a lone skeleton to make it look like it committed suicide. I've cleaned empty hotel rooms and apartment buildings to look lived in and so on.