Matlab is so versatile it is impossible to pin-point appropriate projects. Perhaps if you give us some ideas of what you have done and what you may be interested in we can give some project ideas. Otherwise we're just pulling ideas out of the air.
You don't need to be an expert in Matlab, you just need to have in mind a area of EE that may be of interest to you or something you are proficient in - from there we can suggest you a project.
Matlab is so versatile that it can be manipulated for use in almost any EE project.
