[catawbasam]

Yes. Low-flow shower-heads can pay for themselves in a few weeks. DIY air-sealing with caulk and sprayfoam will also pay for itself in a few weeks in most old homes.

LED lights pay for themselves in a few months if you get a good price on-line or from a home center.

Added attic insulation is another thing that will pay for itself in a few months DIY, or a few years if you pay to have it done.

BuildItSolar has a slightly dated but still useful section about cutting your energy use in half at: http://builditsolar.com/References/Half/Half.htm