There's several ways to do it with faux finishes, the stuff SW is selling now looks fairly easy to use, I've not used it to do tuscan/plaster look yet but you might visit their site and see if it's something that would help. They have a new product line out I think it's called armor faux or something like that. I've done it the traditional way and it's pretty time consuming.
We have done a light fog coat over a lighter solid color, You need to practice on a couple of walls.
We also have done a old white wash look over solid color before. You thin your material down spray fog on and at some but not all corners and edges you let it run down to give it that weathered look. We have also done raging giving it a old world look.
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