I use the spring forward and fall back one and I'm not sure the others really qualify as 'sayings' but:

Stalagmites - mites are creepy crawly so they come from the ground. 
For plugs I use green is for grass so it's earth, blue is for sea\sky so neutral and brown is live 'cos that the colour you'll be if you get it wrong. 

I use some others as well but for the life of me can't think of them at the moment.  Good question Janet

J