How do I gain confidence when choosing fabric colours? I see many, many beautiful quilts made from the most amazing colours used together in a cohesive fashion yet every time I buy fabric, I 'play it safe' resulting in fabric choices with no 'oomph!'

When I find a main fabric I like, I am always drawn to colours in the same range and don't seem to have the imagination to 'see' anything else. My local fabric stores also seem to buy a single pattern in every colour available instead of collections. Any suggestions or recommended books that could help me would be most appreciated.