The pictures of mandala below come from four different traditions. The first picture is named "Mandala of the Seasons".
It was created by Pei-Yee Woo.
The second picture is the Kalachakra mandala.
The third one shows a mandala named Guhyasamaja, one of the five classes of mandala in the Vajravali tradition.
The fourth picture is the Yamantaka Mandala, from Tibet. It was painted on cloth, around 1725.