The phrase "random scraps" refers to small and unpredictable pieces or fragments that don't seem to have any specific order or purpose. Full definition
I love it when random scraps of stuff turn out fantastic! (aggieskitchen.com)
As you can see from the picture above, I dug out random scraps of onion and half eaten brown banana from the depths of my refrigerator. (nuttynutritionandfitness.com)
You would not believe how many food shots I have waiting that I can't remember what the exact recipe was or that I took my notes... but I lost that random scrap paper! (coconutandberries.com)