There are quite a few that I use quite often depending on the situation that they're called for .............
One that I use on a regular basis is ......... 'I don't do problems, I do solutions'
Another is ............... 'As useful as a chocolate tea pot' ................. usually used to describe how helpful or not a person or something is. Another that I use along those lines is 'Too lazy to get out of their own way'
One that I do use, that I first heard on a tv programme, is 'You only have 1 mouth and 2 ears, so you should speak half as much as you listen'.
That one reminds me of the 'Wise old owl who sat in an oak, the more he heard, the less he spoke ........................... '