The 'mix and match' shorelines, stirred up waters and sea textures have a version for mouse use (where you can drag
and drop images), and one for touchscreen computers, where, ironically, you have to tap rather than drag images.
It seemed to work on an ipad. For an iphone you'd need pretty small fingertips. The touchscreen version is only currently designed for up to 20 images.
© Gordon Stokes, 1980-2018