This icon is for Pastie and Parcellite, Linux Clipboard managers. I could not find an icon that fits the elementary-monochrome theme so I made my own following the design of the icon theme. At the same time, I found out that the Pastie Icon should be 22x22 to fit nicely in the status bar as opossed to 24x24 as other icons in the elementary-theme.
I included the source svg file for anyone that wants to modify it.
Just extract the file gtk-paste.zip to your home folder and select elementary-monochrome icon set:
icons: elementary and elementary-monochrome
Hope you like it.