Museums and archives offer a huge range of images, including images of furniture,textiles, and complete interiors. Most of the images are meant for educational purposes only, but they will identify items that outside of copyright and can be used for a variety of purposes. Here is a small selection of sites to get you started.
If you are looking for images to you use for your portfolio or for anything you plan to post on the open web, you need to make sure you have permission to use the content you've chosen. Looking for images from sites that offer images with Creative Commons licenses. The easiest option is to find images with a CC-0 license. See the citing sources page for more info on Creative Commons.