Scarecrows appeared in front of businesses from Aquinnah to Oak Bluffs, from Tisbury to Edgartown over the last week, all part of the Charter School’s effort to dress up the Island for Halloween, and raise a little money in the process. This year’s theme was literary characters, and the student creators of the scarecrows let their imaginations run wild. Now in its 11th year, the exhibit is becoming familiar to Islanders, but there’s no shortage of fresh ideas in the design and fabrication of this year’s crop of creations.