Melocactus azureus Cactus To get the degree of

To get the degree of pink seen in the first image you probably need to keep it on the dry side as a bit of drought stress brings out the most stunning color

Stiff narrow leaves with attractive white markings

Parodia concinna  Also known as Notocactus

They are probably E

Sansevieria kirkii 'Silver Blue'  A very attractive upright Snake Plant or Mother in Law Tongue with thick silvery blue green leaves

Melocactus azureus Cactus To get the degree ofMelocactus azureus Family: Cactaceae. This is a nice cephallium forming cactus with blue to blue green skin. It looks and grows like a normal cactus for several years but once it gets big enough the main plant stops growing but produces a large hairy inflorescence that continues to grow for the rest of the life of the plant. Eventually the inflorescence can be taller than the plant itself. This is more tropical than most cacti so it doesn't like cold