Pillars and columns are so popular for its natural charater of stone and grandiose effect.  The columns or pillars can be used inside as pedestal for loading some artworks or surround pool, stairs, balconys, statue, etc. and the various color of stone can cohere with other buildings very well, create better life.

Different styles columns are available such as corinthian, Ionic, doric, tuscan or composite style columns.
The shape pf columns or pillars can be sqare, round, twist design, rope design, flower design, flat design, tapered columns, fluted columns or customzied design.  The column is classified into different series based on its framworks such as hollow columns, solid columns, splicing columns etc. 
There are different kinds based on the size such as columns, pillars, plinth bases, stone foundations, stone handrails or balustrades, pillars or posts, marble pedestal, stone fences, stone pilasters etc.

Material available: marble, granite, limestone, travertine, sandstone in different color, mixed in slates, quartzite crumbs etc.
Color selection: dark, grey, white, yellow, cream, red, green, pink, blue, muticolor, 
Finished ways: hand-made, casted, splited, machine-made available, polished, honed, flamed, sawn, flat, carved flower etc.
The columns can be divided into parts: column capital or caps, columns basis, column shaft or column trunk etc.
The dimension of these items usually is designed by the engineer,architects, designer or house ownwers so the size is customized commonly