Erasers: what about using em to decorate a box or something? I think a lot of those mini erasers glued over an altoid tin or gift box or something would look really cute
or what about sewing them to a strip of clear plastic to make a belt?
Tape: I saw this idea for those bowls made out of reels of tickets somewhere (I think on this forum). What about making the tape measure into a tiny bowl (rolling it up tightly, shaping it into a bowl, then varnishing), glueing magnetic tape to the bottom, and using it to hold pins and stuff like that for sewing?