All three pictures depict folded hands in a general sense. NOAD defines this expression as:
fold one's hands bring or hold one's hands together
although some dictionaries (such as TFD) are more specific:
fold (verb) (tr) to bring together and intertwine (the arms, legs, etc) : she folded her hands.
That said, I don't think intertwined fingers are required to use the expression.
Because folded hands are a relatively common gesture during prayer, I think there is a generous overlap between folded hands and praying hands. In a book entitled Fantastic Vocation!, Joseph Miksch wrote (the picture shown below is used in the original):
Other writers give a more practical reason; in his book entitled Learning to Pray, Den Slattery said that when his wife teaches children to pray, "they should fold their hands so they aren't tempted to tickle their neighbor."
Regardless of why praying people put their hands together, my point is that any time hands are pressed or clasped together in a prayer-like gesture, we could probably use the term "folded hands" to describe them – even if the person is simply relaxing on a sofa.
I did a Google image search; interestingly enough, all of these pictures had the phrase with folded hands somewhere in their caption.