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I don't think cosplay ships.
But there's a plentitude of fanfiction that ships them. It ships...everyone.
I have a few upthread that ship.
Peppermint Patty & Marcie:
Marcie Fleach (Hot Dog Water) & Velma
Notice how Velma is on HDW's arm
That one may not count as in Scooby Doo, Mysteries Incorporated season 2 Marcie was into Velma. It's beyond subtext, and pretty blatant.
From the intro where HDW fills in for Daphne.
From "The Night The Clown Cried II"
About 38 seconds in, watch Marcie's eyes
8 seconds in: no need to explain this one
1:16 in, and a bit more subtle. Watch Marcie's hand after Fred stops talking the first time.
She's called Hot Dog Water because she smells like the recycled water used to cook hot dogs.
Velma & Daphne
Another two, that I didn't show earlier
On Zombie Island Daphne did get what looks like a non-consensual view up Velma's skirt.
Sailor Uranus & Sailor Neptune
Those may not count since in the original version they supposedly were in a lesbian relationship.
Would love to see some of Susan Ivanova & Talia winters since it's strongly implied that they went to bed together, sexually, in the original B5. Talia wakes up in Susan's bed, reaches for her, but she's not there. Later in series Susan confesses to Delenn that she may have loved Talia. Pretty canon though so it may not count. Claudia Christian (Susan Ivanova) said that she and Talia (Andrea Thompson) were a bit too old for sleepovers.
More shipping cosplay.
Does it count if it's canon for the characters to be together? Not sure why one of them showed up twice.