What do you do with coffee grounds?

When I have used a cafetiere I sometimes pour the dregs on my potted
blueberry bush or camellia. Is this good for it in the same way
(acidic) that tea is? Otherwise I just chuck it on the garden, not
having a compost heap near the door.
If I use a filter paper it goes in the compost bucket.
Any other uses?

Pam in Bristol