Why bother spending more money on electricity next winter just to display Christmas lights. Santa does not approve of more energy being wasted for you to light up your house like the sun. However Santa does approve of holiday cheer. Can we solve this energy dilemma? Sure we can, with a little thinking and a little solar technology we get the Solar String Light, an idea that is long overdue.

From the website

104 LED bulbs.
Select a set for your desired color choice.
Sets available as all white OR white & blue OR green, amber & red.
Several selectable lighting modes/programs.
Modes include flashing, continuous, alternating, twinkling etc.
Built-in photocell ensures automatic operation at night time only.
Very easy to install, no electricity required.
High quality Crystalline solar cell panel.
Solar cell is built into the front of the control panel for outdoor siting.
Integral 6 volt 4 A/hr rechargeable battery (included) housed inside the controller.
Battery is replaceable (recommended every 2-3 years or so).
Battery is housed inside (ABS construction) weatherproof controller.
Illumination time is typically dusk to dawn.
A 6″ (15cm) pole and a 4″ (9cm) ground spike is included.
Light output is not a bright as conventional electric light bulbs therefore best installed in dark locations for better effects.
Approximately 37′ (11 metres) of LED lights on cable.
Lead in (length of wire to first LED bulb) is approximately 6′ (2 metres).
Each LED bulb is spaced approximately 4″ (10cm) apart.
Dimensions of control panel are approximately 7″ x 4″ x 2.5″ (18cm x 11cm x 6cm) LxWxD.

You can also find similar models on Amazon for much less.