Another suggestion for still life. I am not sure of your knowledge or ability but:
You can arrange the objects to give good composition, choose the colours to create harmony or to clash. Move everything around so that the light is from a different direction, diffuse the light, reflect the light. Try different focal lengths at the same, and different, distances. Underexpose, overexpose by different amounts to see the effect. Experiment with different apertures for DoF. Change the ISO to use small apertures at shutter speeds where you can hand hold the camera without shake, check the amount of noise when using high ISO etc.
While doing all that you do not have to worry that the subject is moving, or will disappear.
It really is worthwhile because once you have the subject set up you are no longer worried about getting a good/great picture, it is all about playing and learning.