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"...white, blue and black background."
is that mean we can only using white blue and black, and the background colours must be black?

Dear bluenblack, we are currently using blue backgrounds for day and black for night pictograms. We also use white for our meteograms which can be day and night. Have a look at our website: meteoblue.com. 
~Patrick

Hi,
Dear project holder.
Thanks for posting this project.
I have some queries...Like.
I have found the attachment called ''154699_meteoblue_pictogram_20130610_156933_brief102506''.
What I have to do.Do I need to redesign the of all icon of ''meteobluePICTOGRAMS_35'' & '' meteobluePICTOGRAMS_11-14''.Please help me to understand the project needs.
Hope to hear from you.
Thanks & Regards,
Arindam

Dear Arindam,