Great example of an open group desk arrangement. Student desks are in groups, but all face the smart/white/chalk board. This arrangement facilities a great environment for establishing good student-student relationships.
11 Easy Desk Arrangements for Your Best Classroom Yet
Desk arrangement: put teacher chair in the L of each group for an instant small group, push the four middle ones out for an quick square/round shape. Two desks from each group get folded in and there's an instant group :)