Hi is there any way that we can change the color of the list item?
You can use CSS to change the colours:
Example:
https://www.dropbox.com/s/ud61g65a56s1pnj/List%20Plugin%20Colored.capx?dl=0
or upload a desired photo into it?
Is not possible to use an image with the list or any form object but if you are experienced enough you could build your own custom list with sprite objects though you will have to also keep track of things like indexes, etc... If you are new to construct I will recommend you to just stick to the official plugin to make the things easier.