shuklaaMbaradharaM vishhNuM shashi varNaM chaturbhujaM |
prasanna vadanaM dhyaayet sarva vighnopashaantaye ||

Meaning:One should meditate upon Lord Ganesha, who wears white garment, who is all-pervading, who has a bright complexion, who has four arms, who has poised, pleasant face for removal of all obstacles.

This shloka also refers to Lord Vishnu


vakratu.nDa mahaakaaya koTisuuryasamaprabha |
nirvighnaM kuru me deva sarvakaaryeshhu sarvadaa ||

Meaning:O God Ganesh (large bodied with a large belly), radiant as millions of Suns, Please, remove obstacles in all of my tasks all the time