Don't know the answer to your questions at the moment, but gotta ask..did you look on Ravelry? There are 165 pages of intarsia patterns.
Granted some may be misfiled, but even if there were only a 100..that's a lot of patterns! Some are simple, some complicated, some free, some to buy. Take a look.
I left search box open and just clicked on "pattern browser advanced search." Then I went to the filters and selected "colorwork" and then chose intarsia. You can further filter too for various things.
Not sure what you're getting at... A chart is a chart...a pattern tells you how to make something and if it's an intarsia pattern it will will either have a chart and/or written instruction for the design.