Streaky
/ˈstriːki/
Definition 1 of 2
Pro Tip 1/3Visual Imagery
Use 'streaky' to describe something with visible lines, which could be natural or made by something else. 
The morning sky was streaky with shades of pink and orange.
Pro Tip 2/3Texture Description
'Streaky' often refers to the texture in foods, showing lines of fat or lean meat. 
I prefer my bacon streaky and crispy.
Pro Tip 3/3Uneven Quality
When something is 'streaky', it may imply a lack of consistency in quality, like uneven painting. 
The walls looked streaky after the first coat of paint.