"Pull" donations instead of "Push"
I doubt this is a new idea, but here goes anyway...
How many times have you heard somebody say "I have an extra dragon/pekka/whatever I want to get rid of". Then that person has to wait around until someone wants it, or just go get rid of it at the goblins.
Right now donations are "push" - you have to send them to someone who is requesting them. Being able to "pull" would be nice too. For example, if we could click "Donate" on troops (up to the 5 limit we have for sending to an individual) and it would put them in clan chat with an "Accept" button similar to the one you get when someone wants to join the clan. Anyone could accept them (assuming of course they had not received troops from you in the last 20 minutes) and you had space.
The troops would remain in your barracks until they were taken. Also, any troops not already created after you log off couldn't be donated this way.