Organic shapes

A friend of mine told me to try out a online web based cad program called tinkercad. Im sure alot of you have heard it or even used it. One feature i was shown was kind of cool and was wondering if SU pro has a simular feature. This feature is used to make more organic type shapes. here is a capture of it being used:

I am trying to figure out how to do lower poly objects like castles or towers etc such as this pic: