Online Color Selection Tools
These tools offer differing levels of options:
Sherwin-Williams has a great color tool for assisting with color selection. You can even upload your own pictures and change the color to your walls, ceilings or trim. Here is your chance to really see what your walls will look like – before you buy any paint! We have found the Sherwin-Williams link to be outstanding in its flexibility for trying different colors on walls, ceilings and trim.
The Benjamin Moore and Valspar sites give you minimal capability, but do demonstrate their color selections.