I'm a big believer in using MyBlocks when using EV3. For FLL teams, every robot needs to move forward, backward, turn right, turn left, arm up, arm down. Even before a robot is built, those MyBlocks can be created. However, none of the icons on the available palette of icons seem suited to the task.
Is there a way to add icons to the palette?
The palette of icons for the parameters is much more useful, so for now, we'll ignore that palette.