Although rules of etiquette and "netiquette" are much more relaxed in current times than in years past, it's still a good idea to limit cards with off-color or devilish humor to people you know very well.
Halloween Express: Here, you'll find quite the miscellaneous corset collection, from devilish styles to those that look as innocent as a modern corset possibly can.
The following sites either specialize in devilish humor in their e-cards, or have good collections of cards with off-color and naughty humor.
Mary smiled; a devilish twinkle in her eye.
He laughed, his eyes sparkling with a devilish thought.
As no one could curse Jesus except under the influence of a devilish afflatus, so none could say "Jesus is Lord" except he was inspired by the Holy Spirit.
That devilish Iron Horse, whose ear-rending neigh is heard throughout the town, has muddied the Boiling Spring with his foot, and he it is that has browsed off all the woods on Walden shore, that Trojan horse, with a thousand men in his belly, introduced by mercenary Greeks!
But how cast off all the superfluous, devilish burden of my outer man?
From Catholicism, which he very probably had no detailed knowledge of, he borrowed nothing, rejecting it as devilish error.
No prophet, it was declared, could speak in ecstasy, that was devilish; further, only false prophets accepted gifts.