A frogspawn coral. You can mix some of the species of Euphyllias, you can get them in different colors. I have an "Euphyllia corner" in my tank (5 different colors and species) and it's very nice.
You can mix E. divisa, E. paradivisa, E. ancora and E. paraancora. They can touch each other and mix polips. You shouldn't put E. glabrescens (torch coral) next to them.