Rather than just chucking them away, keep hold of them and put them to good use. A damp sponge tipped applicator is perfect for cleaning smudges off a computer screen and the brushes are great for cleaning out keyboards - I know for a fact you can buy a fancy brush with a picture of a laptop on it to do exactly the same job and it will set you back a whopping £12.99.
They're also fantastic for craft projects. I used a sponge tip applicator from a make up palette when making this clutch bag and they can be so handy for applying glue to fiddly spots or painting something small.
P.S. Have you got any handy uses for these tiny make up tools?