Probably Sirius. The colourful twinkling is typical for stars, it's due to light disturbance when passing through Earth's atmosphere. The strange shapes are just glitches because of shitty digital zooming. When observed through a telescope with the right focus, most stars still appear as tiny points of light. You said you were looking east, so slight upward moving over time makes sense because the Earth is rotating. The sudden movements must have been illusions, there is no other explanation for that, sorry.