A beautiful DIY with plastic bottles. Tip: Use a medium hot iron and place it on the mouth of the bottle to connect the finish! Use baking paper between the Iron and the bottle, so you don't ruin the iron!
Old hacked up keyboard keys + push pins = awesome keyboard thumb tacks! In just a few minutes I modified some keys from old keyboards, hot glued push pins inside of them, and presto, made some keyboard thumbtacks