According to Popular Mechanics, LED lightbulbs last five times longer than a conventional light bulb and use a fraction of the electricity. These lightbulbs have come down in price DRASTICALLY since they first came out.
A low flow showerhead is going to save you money not only on your water bill but also on your HOT WATER bill. The trick is to do some reading to see which shower head still has some decent water pressure.
Instead of wasting paper towels or napkins, you can get cloth napkins. If you are a little crafty, you can sew your own out of clearance fabric or just pick up a set of pretty cloth napkins from Amazon.