This week's art app is another big-time favorite of mine: Tile Deck. I've used it for design work, as well as direct prints on fabric. If you work only in black and white, your images can be used as designs for thermofax designs. It's also a fun way to try out simple pattern repeats that you can make with eraser or foamie (craft foam) stamps.
I've also used it to make some Spoonflower fabrics that I'll share as soon as they are shipped to the studio!
Tile Deck is rather expensive, but, because it makes such fabulous patterns, I think it is well worth the cost -- usually about $5.00. For a while this app was only available on the UK store site, but it's back up on the U.S. Apple App Store here.