The above bookshelf, for instance, could be improvised readily with steel pipe, painted a glossy black, topped with furniture grade shelving. (From the New Bohemian Collection, which is the most steampunk of the collections.)
The camp chair, above, appears in many of the collections. I think there are plenty of wooden folding chairs out there that could be made steampunk with a brocade or leather, perhaps some brass accents.
This photo frame seems like a simple fabrication with some stripped brass canisters.
In the Hilter Hills Collection you find a maritime influenced collection with interesting 'workroom' style furniture.
The La Boheme collection has elements of Gothic Steampunk -- lots of blacks and reds.
And, to a lesser extent, The Sheltering Sky Collection, The Secretariat Collection (it's very horsey), and The Desert Hills Collection for some Western Steampunk.