Using freezer paper to transfer a printed image onto fabric or wood
Sombrilla by Hollie & Harry. I'm a sucker for anything that provides shade at the beach! Could DIY with tent poles and setting grommets in a bedsheet.
Pallet Tutorial - How to quickly and easily disassemble a pallet
DIY color tinted jars
Aged "leather" spell & potion books for Halloween. Made with paint, tissue, and dollar store toys!
DIY Thread Storage Rack for under $5
How to make a mini ironing board from a TV tray - perfect for sewing projects
DIY soy wax candles: cheap supplies, 40-50 hour burn time. Useful tips in the comments. Could add essential oils or dried ground lemongrass for scent/bug repellant.
Pooling experiments with variegated yarn - check out this lady's Ravelry project page
How to Make a Bandanna Quilt in just a few hours. (No binding method.)