Cirrus clouds over the Lower Seletar Reservoir - I used a blue filter in Photoshop to accentuate the blue tones here.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/12449830@N00">Balaji Dutt M V</a> from Singapore, Singapore
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/12449830@N00/333740180/">Piled up</a>