RollingList Type that will move the indexer back to 0 when the end of the list is reached.

RollingList.cs

public class RollingList<T> : List<T>
    {
        private int indexer = 0;
        private int maxIndexer;

        public RollingList() : base()
        {
            maxIndexer = this.Count;
        }

        public RollingList(List<T> list)
        {
            foreach (var v in list)
                this.Add(v);

            maxIndexer = this.Count;
        }

        public new void Add(T item)
        {
            base.Add(item);
            maxIndexer = this.Count;
        }

        public new void Remove(T item)
        {
            base.Remove(item);
            maxIndexer = this.Count;
        }

        public T Next()
        {
            T _ret = this[indexer];

            if (indexer + 1 > maxIndexer - 1)
                indexer = 0;
            else
                indexer++;

            return _ret;
        }
    }