I've just launched my latest product over at the DAZ store, wood materials for Bryce (these are also available as DAZ Studio Shaders). The pack consists of 20 asssorted wood materials all of which are seamless and come with bump maps. There are various wood shades and textures, from smooth to more rough and old looking (some examples are shown below). The materials are bundled in Bryce's .mat file format so they are easy to load into the materials library and use from there.
The pack is on sale until 1st April, at 30% off. Find them hereat the DAZ store.