Sketch plugin to create a blend between two colors
Double click on the file or alternatively, on Sketch go to Plugins > Manage Plugins > Right mouse button on any plugin and click 'Reveal Plugins Folder'. Drag plugin into that folder.
Select two shape objects with a solid color as their fill color, go to ColorBlend > ColorBlend on the Plugins tab and the new blended color will be automatically copied to your pasteboard. Paste it with ⌘ + V as a fill color of another shape, and you're done.
