Other improvements were made to a crossing, a shared path and lighting was updated.
Sandwell Council also supported the project by removing large barriers to help make the path more accessible.
Fenton, who ran workshops with the children to develop the artwork, said: “Local pride emerged strongly through my chats with the pupils with references to Robert Plant and Led Zeppelin, alongside architecture, industry, music, sport, and nature.
“These conversations helped shape a visual narrative that reflects both heritage and identity, rooted in the lived experiences and observations of the young participants.
“All the elements they shared has formed a layered and vibrant mural that celebrates the area’s past and present, while capturing the energy and aspirations of its younger generation.”
Freda Rashdi, head of customer journeys at National Highways, added: “The underpass forms part of a key route in Sandwell linking residential areas with offices and shops.
“In improving the area with better lighting and a new path, we have opened the route up for more people to feel safe walking or cycling to their destinations.
“It is now more accessible and welcoming for the whole community and will give residents a greater choice in how they travel, while showing greater pride in their local heritage and identity.”