Paddles, paddles, paddles.  Simple, but they can be used in a thousand ways.  Slap a wet pot with a paddle while the pot is still on the wheel:  slap it twice to get a somewhat different pattern.  Or roll a handle or foot coil on the surface of a paddle to give the coil a surface pattern. Rolling the coil in different directions will create different patterns.   Or drag the forward edge of the paddle across a clay slab, stopping every once in a while and pushing backwards a slight amount to create a unique pattern -- almost like a tile roof.

 
The glaze paddle works as a regular paddle, of course, but is intended as a paddle to be used to stir or re-stir a bucket of clay.  The sharp corners get into the bottom corner of the bucket, the flat bottom edge scrapes the glaze sludge off the bottom, and the flat surface of the paddle creates enough turbulence to really mix the glaze.  They come with a finish, but an occasional coating of baby oil will make them  easy to rinse off.  I've got about seven or eight around the studio and I use them every time I glaze.  With my classes, when I have lots of folks using lots of different glazes, they are even more useful.