Slim Pickings
The preferred furniture and sundries of carnivorous plants depends on the sentience, of course.
For those that cannot go beyond I-think-therefore-I-am, they will not even be able to intellectually get to Is-that-a-goat-chewing-on-me-and-how-far-will-it-go or similar musings. For this type of SCP, simple beanbag chairs will do (but not real beans--that's cruel).
For those that can actually cogitate up to and including what-is-that-pole-thing-with-the whipping-string-on-its-end, the preferred furniture would likely be just long extension cords with female ends o both sides.
For those that think--out loud, mind you--hey-you-have-the-same-problems-with-crows-that-I-do, Mid-Century-Modern Aviary Faux Chic will do nicely. As the SCP flies, anyway.
Finally, for those SCPs at the top of their game in brain power, the Jeffery Dahmler Collection, studded with the optional lifelike Martha Steward diamondelle accessories will not disappoint, all the way through to the reaping season.
As usual, these offerings are sponsored by the generous folks at Round-Up Consortium, from which no cancer or malignant changes have ever been documented in flora.