pleasing perennial combinations?

I'm starting a new, very large perennial garden this spring  - zone 5,
central Michigan. Portions are full-sun, others part-sun. I'm looking for
recommendations of pleasing perennial combinations - what have you planted
together that looked great? Am especially interested in plants that can be
started from seed, given the large area I'm working with.
   (soil is definitely sandy on the surface, but there may be clay
underneath, as we have some pockets of standing water).
Beth - zone 5

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