Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_26 (colours VARCHAR, head_coach VARCHAR)

### Question ###
What are the colours of the team with benedikt guðmundsson as head coach?

### Accurate SQL ###

SELECT colours FROM table_name_26 WHERE head_coach = "benedikt guðmundsson"