Starting from version 1.2 of this plugin, you can easily control the reflections’ colour. Learn how here.
Once inserted the gallery, switch to Text editing and manually edit the shortcode by inserting the color=”ffccaa” attribute. Change the HEX color ffeebb with any color code you like.
Shortcode: [ gallery type=”imageflow” color=”ffccaa” ids=”5,6,7,8,9,10,11,12″]
For more on Hex color codes, click here