This is one of the cheapest and easiest dyed ribbon DIYs I’ve posted. The materials are food coloring (the cheap kind) and muslin ribbon or fabric.
Other Dyed Ribbon DIYs
DIY Cheap and Easy Dyed Ribbon from The Sweet Escape here. Supplies: Old sheets and food coloring.
DIY Dyed Ribbon from Green Wedding Shoes here. Supplies: Raw silk and dye.
DIY Nail Polish Marbleized Ribbon from Oh Happy Day here. Supplies: Nail polish and cotton ribbon.
And for more ribbon dyeing options, check out this post: DIY Natural Fabric Dye Chart Printable from Design Sponge. At the link there are more suggestions of fruits and vegetables that you can use.