You can find such scripts on various websites. Considering that you want a script that print some ASCII image that looks like flowing water, then I will quickly write one for you. Script:
import time
while True:
___print "1 " * 10; print " 1 " * 10; print " 1 " * 10; time.sleep(0.75); print " 1 " * 10; print " 1 " * 10; print " 1 " * 10; time.sleep(0.75); print "1 " * 10; print " 1 " * 10; print " 1 " * 10; time.sleep(0.75); print " 1 " * 10; print " 1 " * 10; print " 1 " * 10; time.sleep(0.75);
Note (Replace underscore (___) with indentation.