The textures that come packaged with SketchUp have always been a sad affair for interior designers. Tiles, flooring, fabrics all look like they were chosen in 1970. I've often recommended Formfonts http://www.formfonts.com/ as a source of great textures, but their subscription rate is $199 every year.
I'd like to recommend an additional sources of textures: CG Textures http://www.cgtextures.com/ They provide a variety of textures for a variety of fields...including graphic designers and moviemakers. So, you'll find an incredible variety of textures available. Furthermore, you can download some many textures in small versions for free. For a yearly fee of $76, you can download larger files and tileable versions.
Look for more information and a video on how to utilize this amazing resour
ce in my next newsletter.