yast2-theme-SLE from YaST:SLE-12:SP4 project
Select Your Operating System
Add repository and install manually
For SLE 12 SP4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/YaST:SLE-12:SP4/SLE_12_SP4/YaST:SLE-12:SP4.repo zypper refresh zypper install yast2-theme-SLE