you mean like fading on and off (like the animation at the bottom of that page? **broken link removed**)? I dont think it gets any easier than that.
you'll have to describe what you're looking for better, isn't pulsing on and off the same as blinking?
or do you want it to blink slowly?
If that's the case you could use an astable 555 timer, with some potentiometers so that you could adjust the flash rate.
You could also use the 555 to control the amount of time that the led is on compared to the amount of time the led is off. (the led would be off for say, a second, then turn on for about 1/4 of a second. then turn off for another second)
Dunno if it'll help at all, but theres a bunch of led schematics here **broken link removed**