This is a super simple refashion project. I have lots of men's jeans scraps from various refashioning projects. They are too small for making adult clothing/accessories but are perfect for kids' stuff. Here is a reversible hat I made for my toddler using the men's jeans scraps and a red floral cotton skirt I made for myself ions ago.
For the rest of the scraps, I think I'll just sew all the small pieces together and make a bath mat. I'll let the edges fray to give it some character. There are lots of examples of this type of denim rug everywhere on the net.