Monster High, Safari or Jungle Bedroom Ideas. Used this image to make an stencil, printed on Draft to save ink, laminated it and cut the stripes out with a craft knife, will make a great border and can choose any colours.
For two cats, i would do this spuble long and keep it umder a window sill, drill some holes in the back so it can air out, keep both sides totally separate so the cats can have their own space but also keep everything together for cleaning purposes.
Inspiration for jumper or cardigan if cut down the middle? And I might cut up and lengthen the inner sleeve seam, this creating more of a side seam at the same time so it's not quite so revealing on the sides.