I collect lots of "pairs" -- cels that look 
really nice side by side, or somehow otherwise 
seem to go with each other. Since all my scans 
are on my dying computer, I can't show them. . . 
But some of my favorites are:

-- Two closeups of Miyu with identical poses 
right down to the motion of her hair, one is of 
her as a child and one is of her from the last 
episode of the show.

-- Two Blue Seed cels, one of Kusanagi looking to 
the left and a bit amusedly defensive, the other 
of Momiji looking to the right and rather POed in 
nothing but her blouse and (kiddie) panties. ^_^ 
They're not even from the same episode, but put 
side by side, they're a riot.

-- Two Mosquiton cels, one of Mosquiton with 
Camille just after Camille broke the land speed 
record for stripping, and the other of Inaho's 
expression as she walks in on it. *^_^*

And so on. . . But so as not to disappoint you by 
lack of scans, I'll include what I believe is the 
one and only snake in my collection. Took me ten 
minutes to dig it off the old computer, so enjoy 
it! ^_~;;

Many Sharp Smiles,
--Drac