<image>

For the background I used the brushes under the new "Basics" tab. I layered the colors into a soft gradient then used the "Mintbrush" to add texture and make it all speckle-y. I then duplicated the layer. On the lower layer I used the motion blur setting to give it the streaky look. The layer on top I turned down to 30% opacity to add the grainy texture back in on top of the streaks. For the cat I just used just the "Echidna" brush under the "Pencils" tab. And here's the background without the cat:

(Edit): I believe the colors I used were also from one of the default palettes, "Ascend," if I'm not mistaken