I love this question; my wise business coach Ralph begins every session, asking me this. It forces me to look for the good, even when it was a rough week! :)
They say that the feelings of gratitude bring in "good luck" or just good things in general. So the practice of NOTICING the good stuff is important, if you want to draw more good stuff to you.
FOR ME: I got a deposit to hold a painting! This was a big one - it's 72" tall and 24" wide, and it's been sitting around for years. It's an awesome piece (photo below) - the collector who bought it loves to pay CASH. He's one of my favorite buyers.
October has been really slow for art sales (it always is) and so selling this painting on October 30th saved the month :)