Some twisters:

• She sells seashells down by the seashore.
• Peter Piper picked a peck of pickled peppers.
• The sixth sick sheik's sixth sheep's sick.
• She sifted thistles through her thistle-sifter.
• Moses supposes his toeses are roses, but Moses supposes erroneously. For Moses, he knowses his toeses aren't roses, as Moses supposes his toeses to be.
• While we were walking, we were watching window washers wash Washington's windows with warm washing water.
• Red leather, yellow leather.
• Rubber baby buggy bumpers.
• Freshly fried fresh flesh.
• Six twin screwed steel steam cruisers.
• The crow flew over the river with a lump of raw liver.
• Preshrunk silk shirts.
• A bloke's bike back brake block broke.
• She sells sea shells on the sea shore and the shells she sells are seashells I'm sure.
• Tim, the thin twin tinsmith.
• The sixth sheik's sixth sheep's sick.
• Does your shirt shop stock short socks with spots?
• Black bug's blood, black bug's blood.
• The sweetest girl I ever saw sat sipping cider through a straw.
• A pleasant place to place a plaice is a place where a plaice is pleased to be placed!
• Can you imagine an imaginary menagerie manager imagining managing an imaginary menagerie?
• My favorite: I am not a pheasant plucker, I'm a pheasant plucker's son but I'll be plucking pheasants when the pheasant plucker's gone. (careful with this one)