As usual there is a Ravelry group for lovers of this type of design.
You can get lots of ideas for shawls which fall into this category from the group. There's a long thread here listing many of them.
Why aren't all shawls designed this way you ask? It's usually due to the the size and shape of the stitch repeat. Which means sometimes gorgeous stitches don't get put into shawls if you are aiming for adaptability.
My Mary Westmacott Shawl is a good example of one which cannot be easily adjusted. It is created with the beautiful Oriel Lace stitch. I love it so much I used it in several projects for myself before I started designing.
It's a bottom up design and can be enlarged by adding additional repeats at the cast on. The wrinkle is that if a knitter does add repeats there will come a time when the chart runs out but you will still have stitches on your needle. If you are a confident knitter and can maintain the pattern while shaping you are fine and can just keep going. Before I wrote patterns I did this for myself often. I would have a chart of the stitch repeat and I wouldn't bother charting anything else. When I make a pattern to sell I want to give you good value for your money, so I chart out everything. That means less experienced knitters have the ability to work on more complicated designs which would be outside their skill set.
This pattern was designed to work with a single skein of
Mini Maiden, Handmaiden Fine Yarn.