Ray K writes:

I plan to use the sponge-on technique, with one or two coats over the
latex base coat. Almost everything I've read talks about using glazes
over the base coat, with glaze meaning a transparent "paint" that I
would tint to which ever color I choose, using separately bought
coloring agents.

Rather than going to this trouble and expense, why can't I simply have
a paint dealer tint a latex paint of the same sheen to the color I
want, selected from one of those ubiquitous color cards that all paint
stores display?

I've used paint over paint. Works well.