Because sometimes the Missus helps me in the garage, plus my eyecrometer is starting to fail, I decided to colour match my spanners, I wrap a band of coloured electrical tape around the spanners..... 12mm = red, 13mm = blue, 14mm = yellow and 17mm = black, when I go to the drawer of the toolbox, in an instant I can spot what I need in the sea of spanners. To avoid any confusion in the future, please adhere to the above colours ;-) ha ha.
Also, my favourite tool in the workshop is masking tape, I wrap all my socket extensions with it, they are slippery little buggers with oily hands.