I am new to Trulia and I noticed your question and I have some suggestions if you are still interested. A popular and neutral color for staging is "Oat" in the Devine paint pallette. I would also suggest Benjamin Moore's affinity line "Hush" AF-95, harmony AF-90,or jute AF-80. These are just a few of the neutrals that work well for updates. The affinity line is also the line used by Pottery Barn, so if you look in the PB catalogs you will often see a reference to the specific color used in the photo. Also, the affinity line boasts that you can match any three colors and they will, I quote, "seamlessly harmonize with one another". Makes it easy.
Hope this helps.
HSR Certified Professional Home Stager and Redesigner