śuklāmbaradharam viṣṇum

शुक्लाम्बरधरं विष्णुं शशिवर्णं चतुर्भुजम् ।
  प्रसन्नवदनं ध्यायेत् सर्वविघ्नोपशान्तये ।।

śuklāmbaradharam viṣṇum
  śaśivarṇam caturbhujam
prasannavadanam dhyāyet
  sarvavighnopaśāntaye

Lord Ganesha is always dressed in white stands for purity. His gray complexion means that he is everywhere. He has four arms. He destroys all obstacles. I pray to him.