From this page you can download Painting and other things related to it.

Painting
Painting 2 is available from here. When you download Painting, you get the Painting application, 3 Colour Sets, a Readme, Acrobat PDF Documentation, and the Register application.

     Download from sarwat.net
         Stuffit archive, 801 K.

     Download PowerMac-only version from sarwat.net
         Stuffit archive, 556 K.

     Download 68k version from sarwat.net
         Stuffit archive, 511 K.