You can do this today using the Draw-It activity.
1- Launch a lesson with a Draw-it in it
2- Navigate to the Draw-it slide
3- As a student, while in the Draw-it, notice that there is a camera icon
4- Tap on the icon, the camera will pop up
5- Take picture and save
This is only valid for iOS devices for now.
For computers, the students are able to both locally stored images and ones from Google image search.
To do so, have the students click the fourth icon on the bottom left
They can then choose a local or Google search image and add the selected image to their draw it slide. To submit the finished activity, have then click "send".