Adventures of a Middle Sister: DIY Tie-Dye Swimsuit Cover-up. Plain white oversized T-shirt, tie-dye kit, scissors, needle & thread. Could use a T-shirt that's already colorful and skip the tie-dye step.
Create your own dip dyed shoes. You don't have to particularly use yellow dip-dye. I've tried this myself, and I dip-dyed my shoes blue and green instead. It really works! Make sure you have white shoes only, or else it won't work.