Below is my small wooden palette. It is 1/8th inch birch plywood that is stained with Burnt Sienna and sealed with Tung Oil (6 coats). It was traced from Bill Whitaker's palette of the same size.
I love the thing.
I clean it with mineral spirits and I don't let paint dry on it if I can help it. If I do, then Oil of Spike cleans it right up. I rub walnut oil into it after each session and polish it up. It gets more beautiful each day.