As TSG said two of the options are to incorporate the transition, or hide it. It is hard to know which will work best in your space without knowing how big the crown will be and what style you have in mind, etc. Here are some examples of incorporating the window trim with the crown: [[(https://www.houzz.com/photos/traditional-bathroom-traditional-bathroom-new-york-phvw-vp~1034813) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Stamford Architects & Designers Sound Beach Partners LLC [[(https://www.houzz.com/photos/shingle-style-home-in-hanover-nh-victorian-bathroom-burlington-phvw-vp~106093) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Norwich Architects & Designers Smith & Vansant Architects PC [[(https://www.houzz.com/photos/chestnut-street-bathroom-traditional-bathroom-boston-phvw-vp~96002) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Boston Kitchen & Bath Designers Venegas and Company [[(https://www.houzz.com/photos/case-design-remodeling-inc-contemporary-bathroom-dc-metro-phvw-vp~87107) [Contemporary Bathroom[(https://www.houzz.com/photos/contemporary-bathroom-ideas-phbr1-bp~t_712~s_2103) by Bethesda Design-build Firms Case Design/Remodeling, Inc. [[(https://www.houzz.com/photos/weston-residence-traditional-bathroom-boston-phvw-vp~2583807) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Boston Architects & Designers Catalano Architects [[(https://www.houzz.com/photos/louisville-traditional-bathroom-atlanta-phvw-vp~116461) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Canton Furniture and Accessories The Furniture Guild Or transition with window treatments: [[(https://www.houzz.com/photos/fan-victorian-bathroom-los-angeles-phvw-vp~207997) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Los Angeles Interior Designers & Decorators Just Joh [[(https://www.houzz.com/photos/bathrooms-traditional-bathroom-phvw-vp~2678396) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Chester General Contractors ColeBuilt [[(https://www.houzz.com/photos/vacation-home-on-lake-michigan-traditional-bathroom-grand-rapids-phvw-vp~3286791) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Detroit Interior Designers & Decorators Urso Designs [[(https://www.houzz.com/photos/eclectic-bathroom-eclectic-bathroom-atlanta-phvw-vp~137747) [Eclectic Bathroom[(https://www.houzz.com/photos/eclectic-bathroom-ideas-phbr1-bp~t_712~s_2104) and this one, sort of in between: [[(https://www.houzz.com/photos/bluff-plantation-traditional-bathroom-atlanta-phvw-vp~58127) [Traditional Bathroom[(https://www.houzz.com/photos/traditional-bathroom-ideas-phbr1-bp~t_712~s_2107) by Charleston Architects & Designers Frederick + Frederick Architects I hope this gives you some ideas!

Thanks for the replies so far. The window sill would be replaced if we go with the wider casing and may need to be replaced if we go with the narrow too. The padding out would put an inch piece of wood on all sides of the insides of the window (but not cover the glass), basically giving a wider surface onto which to attach the casing. There is just enough room for the 2 1/4 inch trim to fit and clear the corner of the crown. We mounted the crown so the top of the it would line up with the top of the casing. Here is another angle of the other kitchen. To me it looks like they took the wide casing all the way up to the ceiling and that the top of the crown covers a little corner of it. [Traditional Kitchen[(https://www.houzz.com/photos/traditional-kitchen-ideas-phbr1-bp~t_709~s_2107) by San Antonio Kitchen & Bath Designers BRADSHAW DESIGNS LLC

Those pictures are of farmhouse style? Really? They look kind of froufrou to me, and in my book, farmhouses are simple, modest, utilitarian structures. But maybe now that traditional farms are pretty much dead, "farmhouse" is just another label for whatever some highly-paid interior designer thinks looks "traditional." I'm with the rest of the crew here. With 8' ceilings, that's no mansion you have there. Trying to make it look like one with fancy crown molding will just make it look like a parody of one. I say let your house be what its architect meant it to be. But that's just my opinion. It's your house, and if crown molding makes you happy, why not? I'd suggest the narrowest, simplest molding you can find. If the the next person who buys your house doesn't like it, they can always pry it off and patch the holes.

Just Google Ceiling Molding for Craftsman Style House