depends what you want....
as far as my taste goes 3..5 channel is the best.
so all you need is 555 and 4017 wired to count to 4 or 5.
on each channel attach string of 3-4 LEDs and tie all strings
to one resistor to ground (number of LEDs will depend on voltage
you use and Vf of the LEDs). done...
some 15-20 LEDs are no problem without additional circuitry...
if you need more LEDs, add transistors to each used 4017 output
so you get more current. then you can add multiples of strings
per channel...
changing frequency of the 555 will control chasing speed (you can make it reaaaaal slow or just as insane fast as you can still see it....)
next step is your own homemade version of jumbotron