I am a fan of DIY camping equipment. Both using it in the field, or just making it for fun, especially easy to make ones that don't need any specialised equipment.
The attached image is of my homemade windshield, created from an aluminium baking tray ($2). I have used this when camping and it works brilliantly. It is double layer, so I can open it up to be taller to go with a taller gas canister and stove when needed.
Below it is my tuna can stove, which works great at home. I haven't got around to using it in the field...yet.
Not included my DIY failures.
My next project is to make a hexamine tablet stove setup where you can control the flame intensity.
Love to hear about other people's DIY suggestions.