Literal:
* The blade of the knife was sharp enough to cut through the rope.
* The wind whipped the blades of the windmill around.
* The blades of grass were freshly cut and green.
Figurative:
* Her words were like blades, cutting through his carefully constructed facade.
* He was a soldier, trained to use his blade in battle.
* She felt a blade of fear run through her as she stood on the precipice.
Idioms:
* He was on the cutting edge of technology, always developing new ideas.
* The argument got heated, and words were exchanged like blades.
* The doctor used a scalpel, a sharp blade, to perform the surgery.
The best sentence for you will depend on the specific meaning you want to convey.