What designs (plans) does Daisy say she has on Nick and Jordan?

Daisy plans on helping Nick and Jordan fall in love.

Explanation:

Daisy, Nick, and Jordan are characters in the novel "The Great Gatsby", by author F. Scott Fitzgerald. Nick, the narrator, moves to New York. He is invited to dine at his wealthy cousin Daisy's home. Jordan is a golf player and a friend of Daisy's of many years. Nick is intimidated by Jordan at first. She has a haughty demeanor, seeming completely uninterested in him. Still, Daisy plans on making them fall in love and eventually marry each other. She plans on locking them up "accidentally" or sending them out on a boat - all in an effort to force them to spend some time alone and get to know and care for each other. Let's take a look at the excerpt that supports this claim:

‘I will. Good night, Mr. Carraway. See you anon.’

‘Of course you will,’ confirmed Daisy. ‘In fact I think  I’ll arrange a marriage. Come over often, Nick, and I’ll sort  of—oh—fling you together. You know—lock you up accidentally in linen closets and push you out to sea in a boat,  and all that sort of thing——‘

‘Good night,’ called Miss Baker from the stairs. ‘I haven’t  heard a word.

are you kidding? from that description of two mansions, you can't figure out which one is bleak and desolate? maybe you should consider looking those words up in a dictionary, if you don't know what they mean already.