I need them but they are ugly. Saw plastic ones in the gardening shop yesterday and couldn't bring myself to buy such ugly things BUT I do need them. I had leather ones when I was a kid light blue and cream lovely but would that be a huge mistake. (I know they don't make them any more like that!
I wear those green ones which are basically welly boots without the boot bit up your leg!
I've had them for years and years, just leave them by the back door and slip 'em on before I go outside. I have been known to wear Crocs too, but wet grass leaves my socks damp, and as lovevix says, they don't protect you from sharp branches, thorns etc.