Not unless you want them to! Most timber framed houses are indistinguishable in visual appearance from block built houses.
According to a study by COFORD on Timber vs Brick homes, the difference can only be measured in terms of the superior energy efficiency and reduced heating costs of a timber framed building.
Typically timber frame houses are externally clad in block or brick and look the same as any other house. In some instances, home builders may choose timber boarding, stone or a mixture of both for the external walls as part of the house design for enhanced visual effect.