what do i do with olds cds and dvds?
Make a solar oven.
Someone took like 200 CDs, glued them together, put a light in the center, and made a lamp. I think the project is here somewhere.
you could string them up in the garden, especially on fruit trees to scare birds and squirrels
drink coasters, killer throwing stars, xmas decorations, look in the instructables, There are lots of ideas I believe
I cut mine up into small squares and glued them to a foam ball to make a disco ball.