LED blinking array using LC-circuit
Get a 555 timer chip. No programming necessary and there are a gazillion circuit ideas on the net. Google "astable oscillator". It should be able to directly drive a LED directly but if you need more power use a mosfet amplifier.

EDIT to show a calculator for the 555

This website has calculators for various 555 timer circuits. Here's a picture: -



Note the values of R1, R2 and C - these give a frequency of basically 1.5Hz and a duty cycle of about 51%. This is how easy it is but take note that power supply voltage variations will "tweak" the results slightly.

Here's another one: -