There are rarely big murals, but Ljubljana has street art everywhere, you don't even need to pay a lot of attention.
Metelkova
is a sort of a neighborhood that encourages art and social activities, it's a special place, and if you are a free spirit who also loves street art, this is a must see for you. You can read more here
Random streets around the city
there is something about some foxes
and now, sit down and relax