A roll of white paper, neglected stamps and ink. You could also diy wrapping paper by stencilling, splattering, writing or adding stickers. No need to buy and much more personal.
I assembled the stamps on the biggest acrylic block I own ( not that big but am in a no buy mode) and rotated them irregularly.
I think monochrome looks classier and will also use blue washi tape to secure. A coordinating gift tag to finish!