The phrase "a striking showcase" is correct and usable in written English.
It can be used to describe something that is visually impressive or noteworthy, often in the context of an exhibition or presentation.
Example: "The art gallery featured a striking showcase of contemporary artists, drawing in crowds from all over the city."
Alternatives: "an impressive display" or "a remarkable exhibition".
Yet he was nothing but polite when he finally arrived at the gallery, which is featuring "Paintings, Etc.," a striking showcase of his early work, showing the connection between his roots as a painter and his entry into photography.
Priests have an obvious tendency towards verbosity and are prone to doing too much work in a single song: Good Time Charlie packs in dizzying references to Vegas, congressmen and Afghanistan, though it's a striking showcase of Greer and Daniele's spliced vocals: one oozing as the other chants, nimbly switching from sly to seductive to panicked.
At Alexander McQueen, designer Sarah Burton showcased a striking bubblegum-pink tartan trouser suit, complete with kilt.
The tears of clowns never flowed more freely than at the 2016 Edinburgh fringe, which showcased a striking number of standup shows addressing trauma and mental illness, sickness and bereavement.
"It's All Butch" is a striking annual calendar that showcases butch lesbians in a variety of environments.
For fall 2015, Hervé Léger by Max Azria showcased a striking collection filled with luxurious couture techniques such as rich, textured jacquards, stud weavings, tridimensional glass beading, metallic hand studding, and leather appliqué that enriched each look's surface.
The main reception area is a showcase to a striking accordion wall, displaying a panoramic view of the Chicago skyline in one direction (as people enter) and a dramatic map of the world in the other direction (as people exit).
Over the same period, both countries have also started to craft their immigration policy, with Morocco showcasing a fundamental policy shift in 2013 and Tunisia portraying a striking continuity in its immigration policy throughout the revolution.
This is a striking innovation.
