Can the 555 IC help me switch between LED's using a DC power source?

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The discussion centers on using a 555 integrated circuit (IC) to switch between two polarized LEDs powered by a DC source. The user seeks a circuit design that can alternate the LEDs at a defined rate. The 555 IC is suggested as a potential solution due to its popularity and extensive online resources. Participants recommend researching oscillator configurations with the 555 IC to achieve the desired LED switching effect. Utilizing the 555 IC can effectively facilitate the alternating function needed for the LEDs.
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I have a DC power source and 2 LED's. I know they are polarized and only work with the current running one way. I need to swtich between the two electrodes but I am not sure how to design a circuit using a DC source that will switch back and forth at a defined rate. Can anyone suggest either a device or a circuit set up that will allow me to alternate between the two LED's using a DC power source?
 
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Look up oscillators using the 555 integrated circuit, being the very first IC there is probably more information online for it than anything other than Lindsay Lohan.
 

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