Blindness and Seeing which is metaphorical for Lear and real for Gloucester
Animal imagery which can be used to describe Goneril and Regan. It can also be used for Lear as he compares people to animals. It is not until Cordelia dies that he realises the true value of human life.
Clothing can be used to symbolise poverty and power. Poor Tom (Edgar) vs Lear. Clothing is basically pomp and wealth and as Lear casts aside his clothes during the storm he is accepting that power corrupts people etc
Hope this helped.