Here are a couple, & I will definitely do more. As I pick up new techniques along the way, I shall play around with more elaborate images. These are fairly basic, but they get the job done. Feel free to download the images & use if you have an iPhone or similar.
The dimensions are the standard 320 x 480 pixels for the iPhone screen, & the image is actual size, so you can just right click it & "Save Picture as". The format is .png as this is better quality than a .jpeg, but if your phone requires a .jpeg, just open the saved image in any art program & re-save