The Marmoleum tile collection includes Marmoleum Modular tiles with a 2.5mm thickness in sizes of either ~10"x10", 10"x20", or 20"x20". Marmoleum Composition Tile (MCT) is a much greener alternative to Vinyl Composition Tile or VCT. The MCT is approximately 13"x13" and with a 2.0mm thickness.
Forbo has a great tool which enables you to Combine Marmoleum Colors. You can use this tool to see colors adjacent to each other.