4′ x 8′ sheets of walnut plywood are available in thicknesses of 1/4 inch and 3/4 inch. Heartwood in walnut plywood can be anywhere between a lighter, more delicate brown and a dark, chocolate brown with darker brown streaks. There are instances when color has a reddish, purple, or grey tint. Pale yellow-gray to almost white describes sapwood.
You can get high-quality veneer in any specific species. The veneer must be flawless, tightly cut, full length, and devoid of any obvious flaws or anomalies.