Paper has a reflectivitiy of 85% max for example. Usually, white walls are between 70 and if they're very bright, 80...
So, don't go for 1 1 1 white but for, say, 0.75 0.75 0.75 grey, which will appear to be white
Or use a slight tough of colour... For example "Cosmic latte" (a bit darkened so that the contrast is high enough: )
- R 0.85
- G 0.82667
- B 0.77
divide the R, G and B component by ~300 so that you get propper Values, already toned down a bit (to ~85%)
If you want to go for the full luminosity, which will eat contrast and increase render-times, you also can divide by 100 for the full brightness.