Create random list of given length from a list of strings in python

I have a list of strings:

lst = ["orange", "yellow", "green"]    

and I want to randomly repeat the values of strings for a given length.

This is my code:

import itertools
lst = ["orange", "yellow", "green"]
list(itertools.chain.from_iterable(itertools.repeat(x, 2) for x in lst))

This implementation repeats but not randomly and also it repeats equally, whereas it should be random as well with the given length.