As mentioned before, do calves bare footed. Allows a better toe grip and a better stretch. Do calf exercises one foot at a time. Include wind sprints, at a full pace. 4 to 6 sets. Stadium steps included. Try running in looses sand, a real killer for calves, as is hill running.
Seen a very few guy's run backwards (short distance of course) for calves, but don't really recommend it. Also seen some squat while standing on their toes. Requires developing balance at first.
There is the old one day program, which has seemed to work well from what I've been told. I've mentioned this before, probably in this thread...which I don't want to go back to and read everything again.
Example: Use the one legged calf raise (DB optional) and do 1 or 2 light sets of 12-15 reps. Doing this every hour, on the hour, throughout the day. Probably get in 6 to 8 sessions on that day. Don't want to force the reps, never going to the point of failure. Just want an all day pump in the calf area. More blood, more muscle..as the old BB'ing saying goes. The calves can become very "worked" and pumped on this stye of training. Usually a 2 or 3 times a week, this being the only calf exercise done for them.
This type one day program originally was designed for arm work. Again, seemed to work for a lot of guy's and increases in arm size. A few others, not so much. Truth be told, nothing will work for everyone the same way. Even 'roids can work minor miracles for some or nothing much in improvement for others. Good Luck