As long as they're not brown and shriveled, I'd say they look pretty happy. As Daisy said, it's a little difficult to see the color in your pictures. Cactus prefer to be dry rather than too wet, as I'm sure you know. Overwatering them kills more cactus than months of no water.
Looks like they might be growing in a too moisture-retentive potting mix, though. See if you can get some that says "Cactus and Succulents" and then you could re-pot them in a large shallow pot together for a cactus garden. It's more difficult to overwater if you have them growing in a coarse, gritty mix. It doesn't stay wet as long.