Download Pure Pwnage TF2 sprays.
Place the .VTF file in: (your dir)\Steam\steamapps\(your username)\team fortress 2\tf\materials\VGUI\logos
To fix the quick view appearing blank copy the same .VTF also in: (your dir)\Steam\steamapps\(your username)\team fortress 2\tf\materials\VGUI\logos\UI
In game, go to the options and click import the spray and browse for it in the \logos folder (not the UI folder!) and validate. (this will create a VMT file near your VTF)