While some Haworthia species have windows and clear patches, others have darker, chain-shaped patterns, called reticulations within their leaves and they are also attractive and easy to grow. Some of them belong to the species Reticulata and others to the species Marumiana: these can have either retuse or recurved leaves, "recurved" means curving back towards the stem.
This one is Haworthia Reticulata var Hurlinghii - it has little round windows in chain patterns
Haworthia Reticulata var Reddi also has translucent tips and edges as well as the darker chain-patterning. Sometimes, the reticulations are more subtle, as with this one:
There are a number of species of Haworthia Marumiana, which have the same type of reticulate patterning
This last one is Haworthia Marumiana var batesiana, which grows in big clumps and prefers to be kept in shadier conditions. I had it outside but it started looking miserable and it's much happier in my bathroom, which is sunny, but only in the morning. All of the others didn't mind being outside in sunnier conditions. Succulents don't always like huge amounts of sun, that is the biggest mistake that many people make with growing them