Veljko Milkovic is the creator of self-heating ecological house and a large number of ecological innovations, which are in use for years.

His engineering and ecological projects inspired by Petrovaradin fortress are in practice:

• Mushroom Garden and Greenhouse With Reflecting Surfaces (mushroom gardens for growing oyster mushrooms near Cenej and Petrovaradin (Serbia) were built)

• Project "Forests for Food Production" (in use on several locations in Vojvodina, Serbia)

There are also other inventions and patents of Veljko Milkovic that have found application:

• The Line of Universal Tools

• Autonomous Battery Charger (extracts electricity from discarded batteries and fills the accumulator)

• Hand Water Pump With a Pendulum

• Anti-Hemorrhoid Toilet Seat - A Medical Product